Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
dong chuan » dong chan, dong thuan, dong chuyen
chuan dong » chua dong, chuan long, chuyen dong
phan dong » phan cong, phan dang, phan hong
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan ban » van ban
co hieu » cao hieu, doc hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((co hieu) or (theo chieu)) lang - phan dong chuan dong ((cong dan) OR (cong san)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((co hieu) OR (theo chieu)) lang - phan dong chuan dong ((cong dan) OR (cong san)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((co hieu) or (theo chieu)) lang - phan dong chuan dong ((cong dan) OR (cong san)) toan ban".
• Adding a wildcard symbol may retrieve word variants: ((co hieu) or (theo chieu)) lang - phan dong chuan dong ((cong dan) OR (cong san)) toan ban*.