I've come up with a particular problem concerning the morphological search for Hebrew morphology, and this more than once.
What I want to look for is the Hebrew lemma כְּ (= like, according to, even as, about, as soon as). In the WAT:HADHAE resource (Wörterbuch zum Alten Testament), the lemma is spelled with a kaph finale (ךְּ). When doing a morphological search in the BHS (Biblia Hebraica Stuttgartensa) with this spelling ("lemma:ךְּ"; which is suggested automatically), I get no results. I also tried "lemma: כְּ" and "lemma: כ". However, none of this turned out any result, although there should be hundreds or thousands of hits. To me, this seems to hinge on the wrong spelling with the kaph finale.
Anyway, for those, who have the same trouble: There is a workaround: search for "כְּ" only! This works only in the 2006 version of the BHS (LLS:BHSSESB2), not in the 2016 version (LLS:1.0.204).
Customer support tells me they are going to forward my request. Hopefully, this bug will be fixed soon.