Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
mang cua » manh cua, dung cua, ban cua
cua dung » cua dang, cua dong, qua dung
cong tac » cong ty
tac giam » tac gia, tac giai, tac pham
giam tu » gian tu, gia tu, giau tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu lang) or (chieu sach)) - cach mang cua dung cong tac giam tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (chieu sach)) - cach mang cua dung cong tac giam tu.
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) or (chieu sach)) - cach mang cua dung cong tac giam tu*.