Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
trong bai » trong ban, thong bai, trong hai
ho chieu » theo chieu, hoc thieu, doi chieu
tac dung » sach dung, tin dung, van dung
bai toan » bai tap
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 sach - thanh trung ((((tac dung) or (van dong))) or (xay dung)) trong bai toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - thanh trung ((((tac dung) OR (van dong))) OR (xay dung)) trong bai toan cao.
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - thanh trung ((((tac dung) or (van dong))) or (xay dung)) trong bai toan cao*.