Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
tranh han » tranh hang, tranh ban, tran han
trinh han » trinh quan
long doan » cong doan, dong doanh, rong doanh
khoan cam » khoa cam, khoan va, phan cam
hoc hieu » hoc thieu, hoc hien, doc hieu
cong dan » cong san, cong tan, huong dan

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 - canh ((tranh han) OR (trinh han)) thanh ((cong dan) or (long doan)) khoan cam~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - canh ((tranh han) OR (trinh han)) thanh ((cong dan) OR (long doan)) khoan cam.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - canh ((tranh han) OR (trinh han)) thanh ((cong dan) or (long doan)) khoan cam".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh ((tranh han) OR (trinh han)) thanh ((cong dan) or (long doan)) khoan cam*.