Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, nhieu tang
thanh dung » thanh duong, thanh tung, thanh hung
nhung cong » dung cong, thong cong, hang cong
hieu lang » hieu quang, nhieu tang, hieu van
cua nhung » va nhung
dung cua » dung luan, dung cho
cong san » cong tac
toan cau » toan cao, toan ban, toan tap
tan cau » van cau, tan ca, tao cau

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

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