Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh quang
dung quan » dung quang, luong quan, dang quang
kien soat » kiem soat, bien soan, kien hoa
hieu soan » hieu toan, hieu suat, hieu van
quan van » quan va, quan luan, quan doan
van kien » van tien, van hien, van chien
van hieu » cao 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 dung quan van kien soat ) or ( tinh dung luan van hieu soan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung quan van kien soat ) OR ( tinh dung luan van hieu soan )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung quan van kien soat ) or ( tinh dung luan van hieu soan ))*.