Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
hanh doanh » hang doanh, chinh doanh, kinh doanh
chieu sang » chieu sach, chieu xanh, nhieu tang
nhung cong » dung cong, thong cong, hang cong
hieu lang » hieu quang, nhieu tang, hieu van
cua nhung » va nhung
cong dien » dong dien, cong dieu, luong dien
dien van » dien va, dien dan, dien ban

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