Perhaps you should try some spelling variations:
quang tuan » quang thanh, quang cua
hieu soat » hieu suat, hieu hoat, hieu luat
dinh quan » dinh quang, dinh xuan, dinh duan
tien soat » trien hoat, thien hoat, tien hoa
kiem soat » kiem toan
tuan va » toan va, luan va, quan va
va hieu » van hieu, va dieu, va hien
tinh » trinh, minh, kinh
luan » lan

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tinh quang tuan va hieu soat ) or ( dinh quan luan van ((tien soat) or (kiem soat)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh quang tuan va hieu soat ) OR ( dinh quan luan van ((tien soat) OR (kiem soat)) )).
• Adding a wildcard symbol may retrieve word variants: (( tinh quang tuan va hieu soat ) or ( dinh quan luan van ((tien soat) or (kiem soat)) ))*.