Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu quan » hieu qua, lieu quan, thien quan
mang cua » manh cua, dung cua, ban cua
hang cua » hang ca, huong cua, thong cua
cong dan » cong san, cong tan, huong dan
toan cao » toan ban
toan tap » toan ban
ho hieu » ho chieu, hoi hieu, nho hieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu quan - hanh ((mang cua) or (hang cua)) nhung cong dan ((toan cao) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu quan - hanh ((mang cua) OR (hang cua)) nhung cong dan ((toan cao) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu quan - hanh ((mang cua) or (hang cua)) nhung cong dan ((toan cao) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: ho hieu quan - hanh ((mang cua) or (hang cua)) nhung cong dan ((toan cao) OR (toan tap))*.