Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung cua » truong cua, trung tuan, trung cap
hoc hieu » hoc thieu, hoc hien, doc hieu
dan than » ban than, van than, dan toan
dan chan » dan gian, dan ca, van chat

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - thanh trung cua ((nhung cong) OR (thong cong)) ((dan than) OR (dan chan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - thanh trung cua ((nhung cong) OR (thong cong)) ((dan than) or (dan chan)) cau~".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - thanh trung cua ((nhung cong) OR (thong cong)) ((dan than) or (dan chan)) cau*.