Perhaps you should try some spelling variations:
truong quan » trong quan, thong quan, luong quan
trung quan » trong quan, trung tuan, truong quang
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
hoc hieu » hoc thieu, hoc hien, doc hieu
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

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