Perhaps you should try some spelling variations:
hanh trong » hanh trang, hinh trong, chinh trong
hieu lang » chieu sang, hieu quang, nhieu tang
anh trong » anh thuong, dinh trong, lang trong
quan dung » quang dung, quan duong, qua dung
hoc hieu » hoc thieu, hoc hien, doc hieu
cong dan » cong tan, huong dan, cong dong
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 - ((hanh trong) or (anh trong)) quan dung ((cong dan) or (cong san)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - ((hanh trong) OR (anh trong)) quan dung ((cong dan) OR (cong san)) toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - ((hanh trong) or (anh trong)) quan dung ((cong dan) or (cong san)) toan ban*.