Perhaps you should try some spelling variations:
canh thanh » canh tranh, danh thanh, anh thanh
hoc thieu » toc thieu, hoc hien
ho chieu » theo chieu, doi chieu, mot chieu
san bang » can bang, san sang, gan bang
cao bang » cao dang, cao tang, cao nang
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) OR (hoc thieu)) xanh - canh thanh ((san bang) or (cao bang)) cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) xanh - canh thanh ((san bang) OR (cao bang)) cong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (hoc thieu)) xanh - canh thanh ((san bang) or (cao bang)) cong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (hoc thieu)) xanh - canh thanh ((san bang) or (cao bang)) cong dan toan cau*.