Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, nhieu tang
nhung cong » dung cong, thong cong, hang cong
hieu lang » hieu quang, nhieu tang, hieu van
doanh cua » doanh luan
manh cua » ban cua
cong san » cong tac
san van » tan van, luan van, tran van

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)) - canh ((manh cua) or (doanh cua)) nhung cong san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sang) OR (hieu lang)) - canh ((manh cua) OR (doanh cua)) nhung cong san van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sang) OR (hieu lang)) - canh ((manh cua) or (doanh cua)) nhung cong san van ban".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sang) OR (hieu lang)) - canh ((manh cua) or (doanh cua)) nhung cong san van ban*.