Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
hanh trinh » hanh chinh
trong dan » trong dang, trong san, trong tan
ho chieu » hoc thieu, doi chieu, mot chieu
cua dung » cua dang, cua dong, qua dung
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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