Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
nam thuc » nam thuoc, am thuc, nam thu
thuc ban » thuoc ban, thuc dan, thu ban
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
doi cua » dai cua, hoi cua
y nang » ky nang, ly nang, v nang
di cua » dai cua, de cua, do cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach y nang xa hoi. ((hieu ve) or (lieu va)) nam thuc ban thanh ((di cua) OR (doi cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang xa hoi. ((hieu ve) OR (lieu va)) nam thuc ban thanh ((di cua) OR (doi cua)) tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y nang xa hoi. ((hieu ve) or (lieu va)) nam thuc ban thanh ((di cua) OR (doi cua)) tu".
• Adding a wildcard symbol may retrieve word variants: vu sach y nang xa hoi. ((hieu ve) or (lieu va)) nam thuc ban thanh ((di cua) OR (doi cua)) tu*.