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
quan van » quan va, quan luan, quan doan
van kiem » va kiem, van kien, van hieu
hieu ve » hieu van
hieu va » lieu va, hieu qua
luan » lan

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 quan quan van kiem soat ) OR ( trinh dung luan van ((hieu ve) OR (hieu va)) ))~.
• Adding a wildcard symbol may retrieve word variants: (( tinh quan quan van kiem soat ) or ( trinh dung luan van ((hieu ve) or (hieu va)) ))*.