Perhaps you should try some spelling variations:
khoi thuat » ki thuat, hoc thuat
thuat tach » thuat sach, thuat mach, thuat tac
hanh trung » thanh trung, hanh trang, manh trung
cua dung » cua dang, cua dong, qua dung
cong tan » cong tac, cong san, cong thanh
than cau » toan cau, than cap, thanh chau
phan cau » phan dau, phan cac, phan tu

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 - hanh trung ((cua dung) or (cua ban)) cong tan ((than cau) or (phan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: khoi thuat tach - hanh trung ((cua dung) OR (cua ban)) cong tan ((than cau) OR (phan cau)).
• Adding a wildcard symbol may retrieve word variants: khoi thuat tach - hanh trung ((cua dung) or (cua ban)) cong tan ((than cau) or (phan cau))*.