Perhaps you should try some spelling variations:
chiet tach » chieu sach
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh tran » hanh trang, thanh tran, hanh tram
trong ban » trong san, trong tan, trong quan
tran van » luan van
van dung » van dong, xay dung, tin dung
than tap » han tap, phan tap, than cap
toan tap » toan ban

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 ((chiet tach) OR (chieu xanh)) - hanh tran van dung trong ban ((than tap) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chiet tach) or (chieu xanh)) - hanh tran van dung trong ban ((than tap) OR (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: ho ((chiet tach) or (chieu xanh)) - hanh tran van dung trong ban ((than tap) OR (toan tap))*.