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