Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hiem ngan » kim ngan, viem gan
trang cua » tranh cua, tang cua, trung cua
doanh cua » doanh luan
doc hiem » doc hieu, hoc hien, doc viet
cong tac » cong ty
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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