Perhaps you should try some spelling variations:
sang quang » dang quang, hang quang, tang quang
dinh luong » dinh duong, dinh huong, dinh cuong
tinh sang » tinh quang, tinh trang, trinh san
hieu soat » hieu suat, hieu hoat, hieu luat
nam hieu » nam hien, nam chien, cao hieu
luong do » luong dao, cuong do, luong du
van hien » van hieu, van tien
hien so » khien so, bien so, hieu so
do van » dao van, vo van, so 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 sang quang nam hieu soat ) or ( dinh luong do van hien so ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh sang quang nam hieu soat ) OR ( dinh luong do van hien so ))*.