Perhaps you should try some spelling variations:
nong huong » cong huong, dong huong, cong thuong
hieu manh » chieu xanh, hieu nganh, dieu hanh
hoc hieu » hoc thieu, hoc hien, doc hieu
sinh cua » manh cua, sinh va
dinh cuu » dinh chi
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.

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