How make search call text files from app folder

See more:

C#

Windows

XAML

phone

I have implemented a search feature in my app that is working fine. see the code below
But i want to do more with the search feature

xaml

<stackpanel>
                <textbox name="txtSearch" horizontalalignment="Left" height="72" margin="1,10,0,0" textwrapping="Wrap" verticalalignment="Top" width="355" />
                <Button Content="Search" HorizontalAlignment="Right" Margin="1,-75,0,0" VerticalAlignment="Top" Background="#27394d" Click="Search_click"/>
                <textblock fontsize="20" foreground="Black" textwrapping="Wrap">Enter keywords you would love to search in the hymn e.g Hymn 1</textblock>
            </stackpanel>

xaml.cs

public MainPage()
        {
            InitializeComponent();
            Functions.GenerateKeywords();

            // Sample code to localize the ApplicationBar
            //BuildLocalizedApplicationBar();
        }

        protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
        {
            base.OnNavigatedTo(e);

            // Check if ExtendedSplashscreen.xaml is on the backstack  and remove
            if (NavigationService.BackStack.Count() == 1)
            {
                NavigationService.RemoveBackEntry();
            }

        }

        private void Search_click(object sender, RoutedEventArgs e)
        {
            string keyword = txtSearch.Text;
            Uri url = Functions.GetPageUrl(keyword);
            if (url != null)
            {
                NavigationService.Navigate(url);
            }
            else
            {
                MessageBox.Show("Invalid Keyword");
            }
        }

        public class Functions
        {
            static Dictionary<string,> mKeywords = new Dictionary<string,>();
            public static Uri GetPageUrl(string keyword)
            {
                if (mKeywords.ContainsKey(keyword) == true)
                {
                    return mKeywords[keyword];
                }
                else
                {
                    return null;
                }
            }
            public static void GenerateKeywords()
            {
                mKeywords.Add("Hymn 1", new Uri("/Hymn1.xaml", UriKind.Relative));
                mKeywords.Add("Hymn 2", new Uri("/Hymn2.xaml", UriKind.Relative));
                mKeywords.Add("Hymn 3", new Uri("/Hymn3.xaml", UriKind.Relative));
                mKeywords.Add("Hymn 4", new Uri("/Hymn4.xaml", UriKind.Relative));
                mKeywords.Add("Hymn 5", new Uri("/Hymn5.xaml", UriKind.Relative));
                mKeywords.Add("Hymn 6", new Uri("/Hymn6.xaml", UriKind.Relative));
                mKeywords.Add("Hymn 7", new Uri("/Hymn7.xaml", UriKind.Relative));
                mKeywords.Add("Hymn 8", new Uri("/Hymn8.xaml", UriKind.Relative));
                mKeywords.Add("Hymn 9", new Uri("/Hymn9.xaml", UriKind.Relative));
                mKeywords.Add("Hymn 10", new Uri("/Hymn10.xaml", UriKind.Relative));
                mKeywords.Add("Hymn 11", new Uri("/Hymn11.xaml", UriKind.Relative));
                mKeywords.Add("Hymn 12", new Uri("/Hymn12.xaml", UriKind.Relative));
                mKeywords.Add("Hymn 13", new Uri("/Hymn13.xaml", UriKind.Relative));
                mKeywords.Add("Hymn 14", new Uri("/Hymn14.xaml", UriKind.Relative));
            }

1. I will like to add different text files with set of topics in app folder in which
when a user types in a particular topic/keyword in the search field it will search
for that topic in the text files and display it in a xaml page.

NB:The essence of this is that i dont want to hard code the topics in xaml there by creating
numerous xaml pages in my app

2. I will like the search to have an auto complete feature inclusive

Kindly help and thank you in advance