Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
doc hiem » hoc hien, doc viet, dat hiem
doc hieu » toc thieu, hoc thieu, hoc hien
trang va » tran van
cong dan » cong san, cong tan, huong dan
dan phan » doan phan, dan chan, van phan
phan cau » phan dau, phan cac, phan tu

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) OR (doc hieu)) ngan - hanh ((trang va) or (hang va)) nhung cong dan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hiem) OR (doc hieu)) ngan - hanh ((trang va) OR (hang va)) nhung cong dan phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hiem) OR (doc hieu)) ngan - hanh ((trang va) or (hang va)) nhung cong dan phan cau".
• Adding a wildcard symbol may retrieve word variants: ((doc hiem) OR (doc hieu)) ngan - hanh ((trang va) or (hang va)) nhung cong dan phan cau*.