How get number of occurrences in varbinary datatype?

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SQL

T-SQL

I have a table with varbinary datatype (file stream enabled) column which store pdf files as binary , form that i can get result as which of file have 'invoice' word using following query.

SELECT * FROM FileStore WHERE CONTAINS(Document,'invoice')

Here "Document" is varbinary column which store pdf and word files as binary.

From this i want to get words which appear how many times, i mean number of occurrences.

E.G: In one of the pdf got 'invoice' word 5 times , so want to count how many time word appear in that table using query,

Note: i am asking in varbinay datatype, not for nvarchar datatype.

What I have tried:

I tried with string can, but from binary cant found solution.
Any solution much appreciated.


Thanks and Regards

Aravind