Perhaps you should try some spelling variations:
canh trang » canh tranh, hanh trang, thanh trang
banh trang » hanh trang, ban trang, banh rang
hoc chiet » hoc nhiet, hoc hien, hoc viet
hoc thiet » hoc thieu, hoc thuyet, hoc hien
dung cong » dung trong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan ban » van ban
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc chiet) or (hoc thiet)) tach - ((canh trang) OR (banh trang)) va dung cong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chiet) OR (hoc thiet)) tach - ((canh trang) OR (banh trang)) va dung cong dan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chiet) or (hoc thiet)) tach - ((canh trang) OR (banh trang)) va dung cong dan toan ban".
• Adding a wildcard symbol may retrieve word variants: ((hoc chiet) or (hoc thiet)) tach - ((canh trang) OR (banh trang)) va dung cong dan toan ban*.