I have ca. 30 pdf documents I need to search for keywords; how can I do on my MAC?

I have ca. 30 pdf documents I need to search for keywords; when I open these documents in Adobe Reader on my MAC, it shows a Search tool; however, when I search for keywords I know are in the document, none are found.  How can I do a keyword search?

Do you know if the text has been OCR recognised? Are the original documents "scans"?
An easy way to find out, if you can select an individual word or letter? If you are selecting a whole block of text then the document will need to be put through Optical Character Recognition (OCR) software first to enable you to keyword search.

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