Perhaps you should try some spelling variations:
dieu luat » hieu luat, hieu suat, dieu cua
tinh quan » tinh quang, trinh quan, tin quan
quan quan » quan quang, qua quan, quan luan
hieu soan » hieu toan, hieu suat, hieu van
dung dat » dung va, dung tai
quan van » luan van, quan va, quan luan
van hieu » cao hieu

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

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