Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cam thuc » am thuc, cam thu, can thuc
nam thuc » nam thuoc, am thuc, nam thu
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
doi cua » dai cua, hoi cua
so sac » so sach, so dac
sac ky » cac ky, sai ky

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