Perhaps you should try some spelling variations:
quang tran » quang tuan, quang trung, quang thanh
trien hoat » tien hoa
hieu suat » hieu luat, hieu qua
dan quang » dang quang, doan quang, van quang
van hieu » cao hieu
binh dan » minh danh, binh dinh, binh luan
luan » quan, lan

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 luan van hieu suat ) or ( binh dan quang tran ((kiem tra) or (trien hoat)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh dung luan van hieu suat ) OR ( binh dan quang tran ((kiem tra) OR (trien hoat)) )).
• Adding a wildcard symbol may retrieve word variants: (( trinh dung luan van hieu suat ) or ( binh dan quang tran ((kiem tra) or (trien hoat)) ))*.