Perhaps you should try some spelling variations:
thanh trung » thanh tung
theo chieu » theo tieu, theo chu, thi chieu
trung cua » truong cua, trung tuan, trung cap
dang cong » dung cong
ho chieu » hoc thieu, doi chieu, mot chieu
cua dang » cua cong, cua ban
bai toan » bai tap
hai quan » tac quan

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 trung cua dang cong ((bai toan) or (hai quan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (theo chieu)) sach - thanh trung cua dang cong ((bai toan) OR (hai quan)) cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (theo chieu)) sach - thanh trung cua dang cong ((bai toan) or (hai quan)) cau*".