Perhaps you should try some spelling variations:
trinh nang » tinh nang, trinh bang, trinh mang
quang minh » quang ninh, quang binh, hoang minh
dung quan » dung quang, dung luan, luong quan
hieu suat » hieu luat, hieu qua
quan binh » quang binh, quang ninh
bien soan » bien so
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: (( trinh dung quan van hieu suat ) or ( trinh nang ((quan binh) OR (quang minh)) bien soan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh dung quan van hieu suat ) OR ( trinh nang ((quan binh) OR (quang minh)) bien soan )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( trinh dung quan van hieu suat ) or ( trinh nang ((quan binh) OR (quang minh)) bien soan ))".
• Adding a wildcard symbol may retrieve word variants: (( trinh dung quan van hieu suat ) or ( trinh nang ((quan binh) OR (quang minh)) bien soan ))*.