Perhaps you should try some spelling variations:
theo chieu » theo chu, thi chieu
dung cong » dung trong
ho chieu » hoc thieu, doi chieu, mot chieu
anh dang » anh dong, anh dung, anh bang
cong bai » cuong bai, cong hai, cung bai
bai toan » bai tap
toan cau » toan cao, toan ban, toan tap
dang va » dang van, dang vat, hang va
va dung » van dung, va duong, vat dung

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((((theo tieu) or (theo chieu))) or (ho chieu)) sach - anh dang va dung cong bai toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((theo tieu) OR (theo chieu))) OR (ho chieu)) sach - anh dang va dung cong bai toan cau.
• Adding a wildcard symbol may retrieve word variants: ((((theo tieu) or (theo chieu))) or (ho chieu)) sach - anh dang va dung cong bai toan cau*.