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

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) OR (ban hanh)) di 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) OR (ban hanh)) di 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) OR (ban hanh)) di 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) OR (ban hanh)) di cua tu*.