Here is a rundown on the search Options in advanced search:
Substring: if enabled it will search for whatever you inputted as part of a word, if you do not enable it, it will search for whole words only(for example, searching tit with substring on will also finds tits, but with substring off, it will only find tit)
Split: if enabled, it will search as if you inputted several keywords, separated by word boundaries (here are some example word boundaries: space, -, comma, period, !, ?, etc). If disabled it will take the entire input as the keyword.
Search All: this is only available if you enable Split. If Search All is enabled it means all the keywords must be present in the search results, if it's disabled then at least one(so one or more) of the many keywords must be present.