Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung cua » truong cua, trung tuan, dung cua
trung cap » truong cao, trung tam
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) OR (trung cap)) nhung 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) OR (trung cap)) nhung cong ((dan than) or (dan chan)) cau~".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - thanh ((trung cua) OR (trung cap)) nhung cong ((dan than) or (dan chan)) cau*.