Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
canh trinh » canh tranh, hanh trinh, canh tinh
hang hang » nang hang, cang thang, hung thang
ho chieu » hoc thieu, doi chieu, mot chieu
han hang » han chang, ban hang, van hang
cong dan » cong san, cong tan, huong dan
dan van » dang van, doan van, dao van

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 (theo chieu)) sach - canh trinh ((han hang) OR (hang hang)) cong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (theo chieu)) sach - canh trinh ((han hang) OR (hang hang)) cong dan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (theo chieu)) sach - canh trinh ((han hang) OR (hang hang)) cong dan van ban".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (theo chieu)) sach - canh trinh ((han hang) OR (hang hang)) cong dan van ban*.