Perhaps you should try some spelling variations:
khoi thuat » ki thuat, hoc thuat
thuat tach » thuat sach, thuat mach, thuat tac
thanh tung » thanh cong
qua dung » quang dung, qua song, qua cong
cong tac » cong ty
tac than » tac thanh, tam than, tac nhan
than cao » toan cao, thai cao, than cap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: khoi thuat tach - thanh tung ((qua dung) OR (su dung)) cong tac than cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "khoi thuat tach - thanh tung ((qua dung) OR (su dung)) cong tac than cao".
• Adding a wildcard symbol may retrieve word variants: khoi thuat tach - thanh tung ((qua dung) OR (su dung)) cong tac than cao*.