Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
nam thuc » nam thuoc, nam thu, nam tu
thanh de » hanh de, thanh ve, thanh do
bach ty » sach ty, xach tay, bach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cua tu » cua tuc, cua cu, cua te
cua su » qua su

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: vu bach ty nang xa hoi. hieu ve ((nam thuc) OR (am thuc)) ban thanh de ((cua tu) OR (cua su))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu bach ty nang xa hoi. hieu ve ((nam thuc) or (am thuc)) ban thanh de ((cua tu) OR (cua su))~".
• Adding a wildcard symbol may retrieve word variants: vu bach ty nang xa hoi. hieu ve ((nam thuc) or (am thuc)) ban thanh de ((cua tu) OR (cua su))*.