Perhaps you should try some spelling variations:
hoc nhiet » hoc nghien, hoc hien, hoc viet
hoc thiet » hoc thieu, hoc thuyet, hoc hien
hanh tang » hanh trang, anh tang, hanh mang
tang qua » tang quan, tang cua, tang quy
qua dung » quang dung, su dung, qua song
cong dan » cong tan, huong dan, cong dong
cong san » cong tac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc nhiet) or (hoc thiet)) ngan - hanh tang qua dung ((cong dan) or (cong san)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc nhiet) OR (hoc thiet)) ngan - hanh tang qua dung ((cong dan) OR (cong san)) van ban.
• Adding a wildcard symbol may retrieve word variants: ((hoc nhiet) or (hoc thiet)) ngan - hanh tang qua dung ((cong dan) or (cong san)) van ban*.