Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chua xang » chua nang, chuc nang, chu bang
cho chua » cho chu, cho cua, ho chua
tran van » luan van
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap
tang va » trang va, tang van, thang va

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: cho chua xang - hanh ((tang va) OR (tran van)) nhung cong dan than cao~.
• Adding a wildcard symbol may retrieve word variants: cho chua xang - hanh ((tang va) or (tran van)) nhung cong dan than cao*.