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
kiem soat » kiem toan
van kiem » va kiem, van kien, van hieu
luan va » luan van
luat va » xuat va, luat ve, suat va
uan van » luan van, quan van, tan van

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh luong ((luan va) OR (luat va)) hieu soat ) OR ( tinh quang uan van kiem soat ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh luong ((luan va) OR (luat va)) hieu soat ) or ( tinh quang uan van kiem soat ))~".
• Adding a wildcard symbol may retrieve word variants: (( tinh luong ((luan va) OR (luat va)) hieu soat ) or ( tinh quang uan van kiem soat ))*.