Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, nhieu tang
dong doanh » trong doanh, doanh doanh, dong thanh
dung doanh » dung dan, dung dong
hieu lang » hieu quang, nhieu tang, hieu van
canh manh » lanh manh, canh tranh, cach mang
cua nhung » va nhung
manh cua » doanh cua, ban cua

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)) - canh manh cua nhung ((dong doanh) OR (dung doanh)) phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sang) OR (hieu lang)) - canh manh cua nhung ((dong doanh) OR (dung doanh)) phan tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sang) or (hieu lang)) - canh manh cua nhung ((dong doanh) OR (dung doanh)) phan tu*".