Perhaps you should try some spelling variations:
tinh quan » tinh quang, trinh quan, tin quan
quan quan » quan quang, qua quan, quan luan
kiem soat » kiem toan
hieu quan » lieu quan, thien quan, lien quan
quan van » quan va, quan luan, quan doan
van kiem » va kiem, van kien, van hieu
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 quan quan van kiem soat ) or ( trinh dung luan van ((hieu quan) or (hieu qua)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh quan quan van kiem soat ) OR ( trinh dung luan van ((hieu quan) OR (hieu qua)) )).
• Adding a wildcard symbol may retrieve word variants: (( tinh quan quan van kiem soat ) or ( trinh dung luan van ((hieu quan) or (hieu qua)) ))*.