Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
canh tinh » hanh tinh, manh tinh, canh tranh
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
ho chieu » hoc thieu, doi chieu, mot chieu
tinh han » trinh han, tinh than, tinh hai
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 tinh han ((hang cong) OR (dang cong)) dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (theo chieu)) sach - canh tinh han ((hang cong) OR (dang cong)) dan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (theo chieu)) sach - canh tinh han ((hang cong) OR (dang cong)) dan van ban".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (theo chieu)) sach - canh tinh han ((hang cong) OR (dang cong)) dan van ban*.