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
canh manh » lanh manh, canh tranh, cach mang
doan van » doan va, hoang van, luan van
manh va » hanh va, anh va, minh va
dan van » dang van, dao van, tan 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 ((hieu lang) or (chieu sang)) - canh manh va nhung cong ((dan van) OR (doan van)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (chieu sang)) - canh manh va nhung cong ((dan van) OR (doan van)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu lang) or (chieu sang)) - canh manh va nhung cong ((dan van) OR (doan van)) ban".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) or (chieu sang)) - canh manh va nhung cong ((dan van) OR (doan van)) ban*.