Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
hieu manh » chieu xanh, hieu nganh, dieu hanh
trinh han » trinh quan
han thanh » phan thanh, hoan thanh, huan thanh
long doan » cong doan, dong doanh, rong doanh
khoan cam » khoa cam, khoan va, phan cam
hoc hieu » hoc thieu, hoc hien, doc hieu
long dan » nong dan, long van, dong dan
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 trinh han thanh ((((long dan) OR (cong dan))) or (long doan)) khoan cam~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - canh trinh han thanh ((((long dan) OR (cong dan))) OR (long doan)) khoan cam.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - canh trinh han thanh ((((long dan) OR (cong dan))) or (long doan)) khoan cam".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh trinh han thanh ((((long dan) OR (cong dan))) or (long doan)) khoan cam*.