Perhaps you should try some spelling variations:
canh thanh » canh tranh, danh thanh, anh thanh
thieu xanh » chieu xanh, thien anh, thien danh
thong cong » tong cong, thong thong, phong chong
hieu manh » chieu xanh, hieu nganh, dieu hanh
thanh qua » thanh quan, thanh qui, hanh qua
san toan » van toan, dan toan, manh toan
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 ((thieu xanh) OR (hieu manh)) - canh thanh qua ((thong cong) or (trong cong)) san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (hieu manh)) - canh thanh qua ((thong cong) OR (trong cong)) san toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) OR (hieu manh)) - canh thanh qua ((thong cong) or (trong cong)) san toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) OR (hieu manh)) - canh thanh qua ((thong cong) or (trong cong)) san toan ban*.