Perhaps you should try some spelling variations:
luong quan » duong qua
hieu soat » hieu suat, hieu hoat, hieu luat
quang uan » quang tuan, quang ban, quang tran
kiem soat » kiem toan
van kiem » va kiem, van kien, van hieu
vi hieu » vi dieu, va hieu, vo hieu
uan van » luan van, quan van, tan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( dinh ((luong quan) OR (thong quan)) vi hieu soat ) or ( tinh quang uan van kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( dinh ((luong quan) OR (thong quan)) vi hieu soat ) OR ( tinh quang uan van kiem soat ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( dinh ((luong quan) OR (thong quan)) vi hieu soat ) or ( tinh quang uan van kiem soat ))*".