Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
cua thong » cua thuong, cua khong, suat thong
cong lang » cong luong, cong quang, cong ngang
cong vang » cong quang, cong ngang, cong san
hoc hieu » hoc thieu, hoc hien, doc hieu
cua tong » cua cong, cua dong, cua nong
toan ban » van ban

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 thong) OR (cua tong)) ((cong lang) or (cong vang)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - canh tranh ((cua thong) OR (cua tong)) ((cong lang) OR (cong vang)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - canh tranh ((cua thong) OR (cua tong)) ((cong lang) or (cong vang)) toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh tranh ((cua thong) OR (cua tong)) ((cong lang) or (cong vang)) toan ban*.