Perhaps you should try some spelling variations:
nhieu tang » chieu sang, nhiet nang
hieu lang » chieu sang, hieu quang, hieu van
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
chat hang » chat quang, chat chong, chat phong
nong tac » cong tac, nong tan, tuong tac
dong tac » cong tac, dong tai, dong bac
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((nhieu tang) or (hieu lang)) - hanh tinh chat hang ((nong tac) or (dong tac)) phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((nhieu tang) OR (hieu lang)) - hanh tinh chat hang ((nong tac) OR (dong tac)) phan dau.
• Adding a wildcard symbol may retrieve word variants: theo ((nhieu tang) or (hieu lang)) - hanh tinh chat hang ((nong tac) or (dong tac)) phan dau*.