Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
canh trinh » canh tranh, hanh trinh, canh tinh
doi chieu » doc hieu, doi chi, ho chieu
trinh han » trinh quan
hang cong » dang cong, hang nong, bang cong
han hang » hang hang, han chang, ban hang
doan van » doan va, hoang van, luan van
dan van » dang van, dao van, tan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) or (theo chieu)) sach - canh trinh han hang cong ((dan van) or (doan van)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (theo chieu)) sach - canh trinh han hang cong ((dan van) OR (doan van)) ban.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (theo chieu)) sach - canh trinh han hang cong ((dan van) or (doan van)) ban*.