Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
tang luan » dung luan
trong dan » trong dang, trong san, trong tan
tang cua » mang cua, hang cua, thong cua
tong dan » tuong dan, thong dan, cong dan
than ban » thanh ban, toan ban, than man

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: theo chieu sach - hanh ((tang cua) OR (tang luan)) ngan ((tong dan) OR (trong dan)) than ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - hanh ((tang cua) or (tang luan)) ngan ((tong dan) OR (trong dan)) than ban~".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - hanh ((tang cua) or (tang luan)) ngan ((tong dan) OR (trong dan)) than ban*.