Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hieu lang » chieu sang, nhieu tang, hieu van
hanh tang » hanh trang, anh tang, hanh mang
tang cua » mang cua, hang cua, tang luan
cua dung » cua dang, cua dong, qua dung
cong san » cong tac
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 lang) or (hieu quang)) - hanh tang cua dung ((cong dong) or (cong san)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu lang) OR (hieu quang)) - hanh tang cua dung ((cong dong) OR (cong san)) toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu lang) or (hieu quang)) - hanh tang cua dung ((cong dong) or (cong san)) toan ban*.