Perhaps you should try some spelling variations:
tinh luong » tinh huong, dinh luong, minh luong
hieu soat » hieu suat, hieu hoat, hieu luat
quang uan » quang tuan, quang ban, quang tran
van hieu » cao hieu
quan va » quan vi, luan va, quan ve
quan ha » quan he
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: (( tinh luong ((quan va) OR (quan ha)) hieu soat ) or ( tinh quang uan van hieu soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh luong ((quan va) OR (quan ha)) hieu soat ) OR ( tinh quang uan van hieu soat ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh luong ((quan va) OR (quan ha)) hieu soat ) or ( tinh quang uan van hieu soat ))*".