Perhaps you should try some spelling variations:
manh trung » manh tung, thanh trung, manh hung
nhung cong » dung cong, thong cong, nhung don
hieu manh » chieu xanh, hieu nganh, dieu hanh
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung tuan, trung cap
hang cong » dang cong, hang nong, bang cong
dan than » dan chan, ban than, van than
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: hoc ((hieu manh) or (hieu lang)) - manh trung cua ((nhung cong) OR (hang cong)) dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hieu lang)) - manh trung cua ((nhung cong) OR (hang cong)) dan than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (hieu lang)) - manh trung cua ((nhung cong) OR (hang cong)) dan than cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (hieu lang)) - manh trung cua ((nhung cong) OR (hang cong)) dan than cao*.