Perhaps you should try some spelling variations:
dang thanh » dong thanh, dang hanh, hoang thanh
cang thang » cong thanh
nhung cong » dung cong, thong cong, hang cong
lieu tinh » trieu tinh, diep tinh, bien tinh
cua nhung » va nhung
cong dang » cong dong, cong dan, cong dung
toan cao » toan ban
toan tap » toan ban
so lieu » so dieu

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: so lieu tinh - ((cang thang) OR (dang thanh)) cua nhung cong dang ((toan cao) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so lieu tinh - ((cang thang) OR (dang thanh)) cua nhung cong dang ((toan cao) or (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: so lieu tinh - ((cang thang) OR (dang thanh)) cua nhung cong dang ((toan cao) or (toan tap))*.