Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
canh trinh » canh tranh, hanh trinh, canh tinh
trinh han » trinh quan
hang cong » dang cong, hang nong, thanh cong
bang cong » dang cong, bang song, dung cong
ho chieu » hoc thieu, doi chieu, mot chieu
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 cong) OR (bang 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 cong) OR (bang 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 cong) OR (bang cong)) dan van ban".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (theo chieu)) sach - canh trinh han ((hang cong) OR (bang cong)) dan van ban*.