Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
cam thu » nam thu, ca thu, cam phu
cac thu » cach thuc, cac thoi
di cua » dai cua, doi cua, de cua
so sac » so sach, so dac
sac ky » cac ky, sai ky
x hoi » xa hoi, o hoi, x ho

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: so sac ky nang x hoi. hieu ve ((cam thu) OR (cac thu)) ban thanh ((vai cua) OR (di cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sac ky nang x hoi. hieu ve ((cam thu) OR (cac thu)) ban thanh ((vai cua) or (di cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: so sac ky nang x hoi. hieu ve ((cam thu) OR (cac thu)) ban thanh ((vai cua) or (di cua)) tre*.