Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
hoc hieu » hoc thieu, hoc hien, doc hieu
manh cua » doanh cua
dan toan » dan than, manh toan, xuan toan
van toan » van tuan, van tan, van thanh
ban cua » ban quan

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