Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
ho chieu » theo chieu, hoc thieu, mot chieu
va thong » va thuong, va phuong, he thong
cong dan » cong san, cong tan, huong dan
dan phan » doan phan, dan chan, van phan
phan cac » nhan cach, phan dau, phan lap
va tong » va tuong, va trong, va cong

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 (ho chieu)) sach - canh tranh ((va tong) or (va thong)) cong dan phan cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (ho chieu)) sach - canh tranh ((va tong) OR (va thong)) cong dan phan cac.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (ho chieu)) sach - canh tranh ((va tong) or (va thong)) cong dan phan cac".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (ho chieu)) sach - canh tranh ((va tong) or (va thong)) cong dan phan cac*.