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When I do a search, Acrobat treats the letter combination "ti" as though it is the single character "5" How do I fix that?
Seems like you're copying from another document ; a scanned document possibly?
In which case, when you paste the copied item in the search box is acting out as a ligature, or else some sort of unicode decoding/encoding issue.
If this is the case, right-click on that syllable again, but this time, select from the context menu "Copy with Formatting", and then paste it in the search box. See if that works.