Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, nhieu tang
thang cong » thanh cong, thang long, thong cong
hieu lang » hieu quang, nhieu tang, hieu van
trang van » trang va, trong van, tang van
tan thanh » tran thanh, tang thanh, toan thanh
thanh tap » thanh lap, thanh tai, thanh tay
tran van » luan van
cong tan » cong tac, cong san, cong thanh

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 ((trang van) OR (tran van)) thang cong tan thanh tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sang) OR (hieu lang)) - hanh ((trang van) OR (tran van)) thang cong tan thanh tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sang) or (hieu lang)) - hanh ((trang van) OR (tran van)) thang cong tan thanh tap".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sang) or (hieu lang)) - hanh ((trang van) OR (tran van)) thang cong tan thanh tap*.