When i searchfor a word inside a file, it took a while. Some times the screen goes off after few seconds while the searching process is ongoing, so i tap/touch the screen to keep it running but adope cancels the search. I tried to stop to keep the search running but it always canceled. Even if i let the screen went off the search stops.
Sadeq Ebrahimi commented
also some time search dose not work. for instance I search "Proof of Theorem 1.2" in a document but the result say that "no matches found " since I just copied that word or sentence