Perhaps you should try some spelling variations:
thanh trung » thanh tung
theo chieu » theo tieu, ho chieu, thi chieu
tam duong » tam huong, tuan duong, thao duong
trong bai » trong ban, thong bai, trong hai
theo chu » cho chu, chao chu, theo yeu
tam dung » tac dung, tan dung, am dung
bai toan » bai tap
toan cau » 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: ((theo chieu) or (theo chu)) sach - thanh trung ((tam dung) OR (tam duong)) trong bai toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (theo chu)) sach - thanh trung ((tam dung) OR (tam duong)) trong bai toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (theo chu)) sach - thanh trung ((tam dung) OR (tam duong)) trong bai toan cau".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (theo chu)) sach - thanh trung ((tam dung) OR (tam duong)) trong bai toan cau*.