Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
ho chieu » hoc thieu, doi chieu, mot chieu
van dung » van dong, xay dung, tin dung
cong van » cong vang, cong san, song van
va dung » va duong, vat dung, va ung
van tai » von tai, van tuan
tai tap » bai tap, tai tao, hai tap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (theo chieu)) sach - canh tranh ((va dung) OR (van dung)) cong van tai tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (theo chieu)) sach - canh tranh ((va dung) OR (van dung)) cong van tai tap~".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (theo chieu)) sach - canh tranh ((va dung) OR (van dung)) cong van tai tap*.