Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, nhieu tang
trung chua » trung cua, trong chuan, trung hoa
hieu lang » hieu quang, nhieu tang, hieu van
dong cong » duong cong, dung cong, dang cong
trung ha » trung hoc, trung tam, trung cap
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than tap » toan tap, han tap, phan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sang) OR (hieu lang)) - manh ((trung chua) or (trung ha)) dong cong tan than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sang) OR (hieu lang)) - manh ((trung chua) OR (trung ha)) dong cong tan than tap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sang) OR (hieu lang)) - manh ((trung chua) or (trung ha)) dong cong tan than tap*".