Find Formula to search "Approx match"

I have this formula on a large sheet that I need a way for it to find "approx matches" (without rewriting the entire formula)

So would anyone have an idea how to rewrite this to find anything with OFF in the name?

Here is the formula, i will have other names (with using OFF in them) so this is what I need to find APPROX Match


=IF('P1'!$U$13="SICK","",IF('P1'!$U$13="OWED","",IF('P1'!$U$13="OFF","",IF('P1'!$U$13="REQ OFF","",IF('P1'!$U$13="LOA","",IF('P1'!$U$13="VACA","",IF('P1'!$U$13>1,"X","")))))))