Shorts steal fun from searching, I consider to stop searching because of them!
Shorts really sucks. Since it's a new type of videos, YouTube should at least update its search filters to hide videos of a certain duration (like short than 1 minute, for example)
By the way, in the past few days I've been trying to find some search operator to delimitate the length range, but no success.
For now, the only way i figured out to avoid search result pollution is using the good and old operator to exclude keywords, in this case the channels names. For example: -"doctor teeth dk" -"clinic tooth brace"
Considering it's a hard work, I would suggest starting some "shorts channels" blacklist.