Well the song request by name / artist basically does a youtube search and tries to match the text with a video. I recommend using a link if the bot doesn't respond to the initial request.
I did a couple of youtube searches with the words in the first few requests and there was like one video for "vacker tass" but no artists was included in the request, so that may be why it didn't pick it up. "ebain de har en" doesn't pick up any videos with those words in it."adam tensta" is just an artist name, you also need a song name. "ortens favoriter" should have been picked up, since there are quite a few videos, but not 100% sure why, maybe needed an artist name as well.