Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh de » hanh de, thanh ve, thanh do
nam thuc » nam thuoc, am thuc, nam thu
thuc ban » thuoc ban, thuc dan, thu ban
vu sach » vu bach, su sach, vu khach
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
cua cu » cua chu, cua cau, cua co
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 sach ty nang xa hoi. ((hieu ve) OR (hieu va)) nam thuc ban thanh de ((cua cu) OR (cua su))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty nang xa hoi. ((hieu ve) or (hieu va)) nam thuc ban thanh de ((cua cu) OR (cua su))~".
• Adding a wildcard symbol may retrieve word variants: vu sach ty nang xa hoi. ((hieu ve) or (hieu va)) nam thuc ban thanh de ((cua cu) OR (cua su))*.