Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, nhieu tang
luong cong » dung cong, trong cong, cong cong
hieu lang » hieu quang, nhieu tang, hieu van
trung dai » truong dai, truong dao, trung cap
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cap » khan cap, thanh lap, thanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sang) OR (hieu lang)) - hanh ((trung dai) or (trung tam)) luong cong dan than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sang) OR (hieu lang)) - hanh ((trung dai) OR (trung tam)) luong cong dan than cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sang) OR (hieu lang)) - hanh ((trung dai) or (trung tam)) luong cong dan than cap".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sang) OR (hieu lang)) - hanh ((trung dai) or (trung tam)) luong cong dan than cap*.