Perhaps you should try some spelling variations:
dung lang » dung dang, dung nang, dung land
hieu luat » hieu qua
hieu suat » hieu qua
gian luan » gian lan, gia luan, gian quang
luan dieu » luan tieu, lan dieu, luan hieu
lang van » dang van, tang van, hoang van
tinh qua » tinh quan, trinh qua, tinh cua
qua gian » qua giang, qua gia, qua giai
dieu hat » dieu hanh, dieu khac, dieu can

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tin dung lang van ((hieu luat) or (hieu suat)) ) or ( tinh qua gian luan dieu hat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung lang van ((hieu luat) OR (hieu suat)) ) OR ( tinh qua gian luan dieu hat )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung lang van ((hieu luat) or (hieu suat)) ) or ( tinh qua gian luan dieu hat ))*.