Problem with unicode in Google map

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VB

Google

mapping

I use Webbrowser control for Google map with Get Dicrections service (From addr: 14 Phổ Quang, phường 2, Tan Binh District, Ho Chi Minh City, Vietnam to Rex Hotel, Nguyễn Huệ, Bến Nghé, Ho Chi Minh City, Vietnam).

Here's code:

Private Sub Mygooglemap_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim Linkweb As String = "http://maps.google.com/maps?&saddr="
        Dim add_start As String ="14 Phổ Quang, phường 2, Tan Binh District, Ho Chi Minh City, Vietnam"
        Dim add_end  As String ="Rex Hotel, Nguyễn Huệ, Bến Nghé, Ho Chi Minh City, Vietnam"
        add_start = Replace(add_start, " ", "+")
        add_end = Replace(add_end, " ", "+")
        Linkweb = Linkweb & add_strat & "&daddr=" & add_end
        WebBrowser1.Navigate(Linkweb, False)
End Sub

But View of Google Map can not display unicode in Addr A and Addr B, then map does show exactly.

Please, help.