Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
hieu manh » chieu xanh, hieu nganh, dieu hanh
trinh cua » tinh cua, trinh luat, trinh quan
hoc hieu » hoc thieu, hoc hien, doc hieu
cua dung » cua dang, cua dong, qua dung
than cao » toan cao, thai cao, than cap
dong tu » dong luc, thong tu, dong 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 - canh trinh cua dung ((dong tu) or (cong ty)) than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - canh trinh cua dung ((dong tu) OR (cong ty)) than cao.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh trinh cua dung ((dong tu) or (cong ty)) than cao*.