Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
thong cong » trong cong, tong cong, thong thong
ho chieu » theo chieu, hoc thieu, doi chieu
doc hieu » toc thieu, hoc thieu, hoc hien
trinh va » trinh van, trinh vat, trinh ve
va thong » va thuong, va phuong, he thong
dan toan » van toan, dan than, manh toan

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 (doc hieu)) sach - canh trinh va thong cong ((dan toan) or (dan gian)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doc hieu)) sach - canh trinh va thong cong ((dan toan) OR (dan gian)) tap.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doc hieu)) sach - canh trinh va thong cong ((dan toan) or (dan gian)) tap*.