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 » xay 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 (sach dung)) trong bai toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - thanh trung ((tac dung) OR (sach dung)) trong bai toan cao".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - thanh trung ((tac dung) OR (sach dung)) trong bai toan cao*.