Perhaps you should try some spelling variations:
khoi thuat » ki thuat, hoc thuat
thuat tach » thuat sach, thuat mach, thuat tac
trung quan » truong quan, trong quan, trung tuan
dung cong » dung trong
tung qua » dung qua, tuong quan, duong qua
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) OR (trung quan)) dung cong tac than cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "khoi thuat tach - thanh ((tung qua) OR (trung quan)) dung cong tac than cao".
• Adding a wildcard symbol may retrieve word variants: khoi thuat tach - thanh ((tung qua) OR (trung quan)) dung cong tac than cao*.