Perhaps you should try some spelling variations:
hieu quan » hieu qua, lieu quan, thien quan
nho hieu » nha hieu, nho sieu, nhu hieu
tranh va » tranh van, trang va, trinh va
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan tai » doanh tai, toan ban, toan cao
toan tap » toan ban

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

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