Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
mang cua » dung cua, ban cua, cong cua
manh cua » doanh cua, ban cua
cong dan » cong san, cong tan, huong dan
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap
ho hieu » ho chieu, hoi hieu, nho hieu

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: ho hieu lang - nhanh ((mang cua) OR (manh cua)) nhung cong dan ((toan cau) OR (toan cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - nhanh ((mang cua) OR (manh cua)) nhung cong dan ((toan cau) or (toan cao))~".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - nhanh ((mang cua) OR (manh cua)) nhung cong dan ((toan cau) or (toan cao))*.