Since the API is “just” parsing the website and therefore the whole search-algorithm is done by myanimelist. It is like you would search on myanimelist by yourself so whatever name you take be it japanese, a synonym, the english title or the original title it should find it. But like I said there could be problems with encoding when using the kanji etc…
Don’t try to match your Anime right now because the API that is live is broken, don’t know why. Also If you have problems with matching you should check your naming convention and use the Title of the Anime that is Listed on Myanimelist. In a few situations in my Library I had to take the english name for example for “Fairy Tail (2014)” i had to take “Fairy Tail Series 2” or “K” (for obvious reasons 
) i used “K-Project”. So alternative titles work but I would only recommend using them if the title doesn’t work.
Dude 
Huge thanks for the donation.
