Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
tranh cua » doanh cua, manh cua
hoc hieu » hoc thieu, hoc hien, doc hieu
hanh qua » thanh qua, hanh sua, hanh cua
than cao » toan cao, thai cao, than cap
cong tu » cong ty, dong tu, cong ti
cong cu » chung cu

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 cua) or (hanh qua)) dung ((cong tu) or (cong cu)) than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - canh ((tranh cua) OR (hanh qua)) dung ((cong tu) OR (cong cu)) than cao.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh ((tranh cua) or (hanh qua)) dung ((cong tu) or (cong cu)) than cao*.