Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
hanh manh » hanh mang, lanh manh, hoang manh
hoc hieu » hoc thieu, hoc hien, doc hieu
cua hang » cua dang, cua nhung, cua ban
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan ban » van ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh manh ((cua hang) OR (cua cong)) cong dan toan ban~.
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh manh ((cua hang) or (cua cong)) cong dan toan ban*.