I may well be repeating something someone has already posted in the past, if so, apologies - this tip will possibly be of help to newbies, and maybe a few "oldbies" as well!
I have lost count of the number of times I have wanted to put in just two letters in the First Name or Last Name box, and can't because the search engine can't return a result, but there's a workaround - if you've exhausted all other possible options,
put no characters in either field - it will ignore the search engine's inability to perform.
Try first by filling out as many other fields as are likely, and you'll get all the people (and I mean all, this is a needle-in-a-haystack job) who fit those categories. You might spot your mistranscribed ancestor quite quickly, but if that yields no-one suitable, delete the fields one at a time and try different combinations - e.g. try deleting year born in case the age is mistranscribed; if that doesn't work, put the year back in and delete the birthplace, in case that's mistranscribed; then try with neither but with all the other fields filled and so on, trying all the possible permutations until you get to the last resort - which is to search by just putting one place name at a time in the Keyword field.
This is best done for smaller areas - don't do it for Liverpool, or you'll be there all night...
One caveat to this - it obviously won't find all instances if the place name has been mistranscribed here and there, so if it ain't there, it doesn't necessarily mean it ain't there at all...you might then have to start imagining what the transcribers might have thought they saw, but as a workaround, it's a good deal better than browsing every page in a district - I've done this on occasions, and that really is the
absolute last resort!