Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
canh thanh » canh tranh, danh thanh, anh thanh
thanh qua » thanh quan, thanh qui, hanh qua
cong cong » cong dong, trong cong, dung cong
ho chieu » hoc thieu, doi chieu, mot chieu
qua cong » cua cong, qua song, va cong
tran van » luan van
tan van » tang van, luan van, dang van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (ho chieu)) sach - canh thanh qua cong cong ((tan van) OR (tran van)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (ho chieu)) sach - canh thanh qua cong cong ((tan van) OR (tran van)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (ho chieu)) sach - canh thanh qua cong cong ((tan van) OR (tran van)) ban".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (ho chieu)) sach - canh thanh qua cong cong ((tan van) OR (tran van)) ban*.