Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
hang hang » nang hang, cang thang, hung thang
ho chieu » theo chieu, hoc thieu, mot chieu
ca nhung » cua nhung, cam nhung, va nhung
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
hang ca » hang va, nang cao, hang tai
thi cao » thai cao, thi hao, thi bao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (doi chieu)) sach - hang hang ca nhung ((cong dan) OR (cong san)) thi cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) sach - hang hang ca nhung ((cong dan) OR (cong san)) thi cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doi chieu)) sach - hang hang ca nhung ((cong dan) OR (cong san)) thi cao".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) sach - hang hang ca nhung ((cong dan) OR (cong san)) thi cao*.