Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
thanh hang » thanh hoang, thanh thang, tranh hang
cong manh » duong manh, cong thanh, hoang manh
cong danh » cuong danh, cong dan, cong thanh
ho chieu » hoc thieu, doi chieu, mot chieu
toan cao » toan ban, toan tap
va tong » va thong, va tuong, va trong

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 - thanh hang va tong ((cong manh) OR (cong danh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (theo chieu)) sach - thanh hang va tong ((cong manh) OR (cong danh)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (theo chieu)) sach - thanh hang va tong ((cong manh) OR (cong danh)) toan cao".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (theo chieu)) sach - thanh hang va tong ((cong manh) OR (cong danh)) toan cao*.