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
phan cau » phan cac, phan tu, phan lap
phan dau » phan tu, hang dau

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 ((phan cau) OR (phan dau))~.
• 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 ((phan cau) OR (phan dau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hiem ngan - hanh ((trang va) or (hang va)) nhung cong dan ((phan cau) OR (phan dau))".
• Adding a wildcard symbol may retrieve word variants: doc hiem ngan - hanh ((trang va) or (hang va)) nhung cong dan ((phan cau) OR (phan dau))*.