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

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

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