Native English speaker here. What is the difference in meaning between "the cat searches after the mouse" and "the cat searches for the mouse"? I only ask because "searches after" is not an accepted translation.
Two points here. First, "søger" means "look, seek, or search"; second, "efter" can mean several things in English including "after "or "for". Here the program only accepts searh and rejects the use of seek and also rejects the use of after. "For the cat" and "after the cat" are both acceptable English and I believe a correct translation.