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
cong luan » tong luan, cong tuan, dong luan
luan phan » luan van, luan hoan
manh cua » ban cua
phan dau » phan tu, hang dau

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

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