Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hang hang » nang hang, cang thang, hung thang
cau thang » cang thang, nam thang, sau thong
cuu thanh » cuu tinh
hoc hieu » hoc thieu, hoc hien, doc hieu
ca thang » ca tang, ca chang, la thang
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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