Perhaps you should try some spelling variations:
thoi quyet » toi quyet, theo quyet, thoi quen
quen vang » que lang, quen hanh, quet lang
nhung bi » nhung bai, nhung gi
quan van » luan van, quan va, quan luan
truc may » tren may, truc va
que van » qua van, quy van, quyet van
tu lap » truc lap

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: nhung bi ((((quen vang) OR (quan van))) OR (que van)). thoi quyet ((tu lap) OR (truc may))~.
• Adding a wildcard symbol may retrieve word variants: nhung bi ((((quen vang) or (quan van))) or (que van)). thoi quyet ((tu lap) or (truc may))*.