Perhaps you should try some spelling variations:
tinh khong » tinh khang, tinh huong, benh khong
tinh dung » trinh dung, tin dung, tinh quang
dung quan » dung quang, dung luan, luong quan
hieu soat » hieu suat, hieu hoat, hieu luat
kien soat » kiem soat, bien soan, kien hoa
quan vi » quan li, quan tri, quan doi
vi hieu » vi dieu, va hieu, vo hieu
quan va » quan ha, luan va, quan ve
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 dung quan vi hieu soat ) or ( tinh khong ((quan va) or (luan van)) kien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung quan vi hieu soat ) OR ( tinh khong ((quan va) OR (luan van)) kien soat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung quan vi hieu soat ) or ( tinh khong ((quan va) or (luan van)) kien soat ))*.