Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hang hang » nang hang, cang thang, hung thang
hoc hieu » hoc thieu, hoc hien, doc hieu
ca thang » cau thang, ca tang, ca chang
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
toan cau » toan cao, toan ban, toan tap
hang ca » hang va, nang cao, hang tai

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 - hang hang ca thang ((cong dan) or (cong tan)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - hang hang ca thang ((cong dan) OR (cong tan)) toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - hang hang ca thang ((cong dan) or (cong tan)) toan cau*.