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Hey guys how do I search for 3 letter stuff I know have been shared, but I might not have grabbed?

Like if I search on cpa I can't and since BBHF is trying to stay out of google I can't really use that.

So would it be possible to make an option to search for just 3 characters?

Mobhugger, i am doing like this:
https://www.google.com/search?q=site%3Ab...8Qe-y4C4DQ
https://www.google.com/search?q=site%3Ab...8Qe-y4C4DQ

Search the term with a letter added after and it gives you the most simmilar threads. :)
Like: CPA a