Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
thanh tung » thanh cong
nhung cong » thong cong, hang cong, nhung don
thanh khan » thanh phan, thanh nhan, thanh thanh
dung cong » dung trong
ho chieu » hoc thieu, doi chieu, mot chieu
tung dam » trung dam, tung dan, tong dam
khan cap » khan ap, than cap, khoan cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (ho chieu)) xanh - thanh tung dam ((nhung cong) or (dung cong)) thanh khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (ho chieu)) xanh - thanh tung dam ((nhung cong) OR (dung cong)) thanh khan cap.
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (ho chieu)) xanh - thanh tung dam ((nhung cong) or (dung cong)) thanh khan cap*.