Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu cach » hieu cac, hieu ca, biet cach
trong tan » trong quan, trong cac, cong tan
hanh han » hanh nhan, hanh phan, hanh san
cua dung » cua dang, cua dong, qua dung
trong ca » trong cac, trong nha
than ban » thanh ban, toan ban, than man
han cua » hang cua, nhan cua, than cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu cach) or (chieu sach)) - hanh han cua dung ((trong tan) or (trong ca)) than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu cach) OR (chieu sach)) - hanh han cua dung ((trong tan) OR (trong ca)) than ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu cach) or (chieu sach)) - hanh han cua dung ((trong tan) or (trong ca)) than ban*.