Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
tranh van » tran van, thanh van, tranh ban
trinh van » trinh han, trinh quan, trinh toan
manh toan » thanh toan, anh tuan, tinh toan
hoc hieu » hoc thieu, hoc hien, doc hieu
san toan » van toan, dan toan, xuan toan

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 - canh ((tranh van) OR (trinh van)) phuong cong ((san toan) OR (manh toan)) ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - canh ((tranh van) OR (trinh van)) phuong cong ((san toan) or (manh toan)) ban~".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh ((tranh van) OR (trinh van)) phuong cong ((san toan) or (manh toan)) ban*.