Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh tung » thanh tung, manh tung, hanh dung
hoc hieu » hoc thieu, hoc hien, doc hieu
anh tang » anh bang, anh dang, anh nang
cua hang » cua dang, cua nhung, cua cong
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
phan dau » phan tu, hang dau

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 tung) or (anh tang)) cua hang ((cong dan) OR (cong tan)) phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - ((hanh tung) OR (anh tang)) cua hang ((cong dan) OR (cong tan)) phan dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - ((hanh tung) or (anh tang)) cua hang ((cong dan) OR (cong tan)) phan dau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - ((hanh tung) or (anh tang)) cua hang ((cong dan) OR (cong tan)) phan dau*.