Should you include common misspelling, variations/tense of the word IE: choke, choked, choker, chokes, choking, or gift vs present, mom mother mommy ma, whiskey whisky wisky etc in the back end search terms?

I have tried googling this and all I have found is that you don’t need filler words like of and with, and you don’t need plurals, however I have seen a lot of mixed advice about misspellings and tense of word, any clarifications or input would be great!