Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
canh trinh » canh tranh, hanh trinh, canh tinh
vuong tin » luong tin, vuong tan, duong tien
ho chieu » hoc thieu, doi chieu, mot chieu
tin toan » tinh toan, nin toan, trinh toan
toan cau » toan cao, toan ban, toan tap
va hung » van hung, va huong, va ung

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 ((va hung) OR (va nhung)) vuong tin toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (theo chieu)) sach - canh trinh ((va hung) OR (va nhung)) vuong tin toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (theo chieu)) sach - canh trinh ((va hung) OR (va nhung)) vuong tin toan cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (theo chieu)) sach - canh trinh ((va hung) OR (va nhung)) vuong tin toan cau*.