Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hiem ngan » kim ngan, viem gan
doc hiem » doc hieu, hoc hien, doc viet
trang va » tran van
cong dan » cong san, cong tan, huong dan
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh 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 hiem ngan - hanh ((trang va) or (hang va)) nhung cong dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hiem ngan - hanh ((trang va) OR (hang va)) nhung cong dan chan cau.
• Adding a wildcard symbol may retrieve word variants: doc hiem ngan - hanh ((trang va) or (hang va)) nhung cong dan chan cau*.