Perhaps you should try some spelling variations:
doanh ban » doanh bat, doanh van, doanh nhan
thu sach » tu sach, thuat sach, thuoc sach
va doanh » van doanh, vay doanh, va danh
thu san » thuy san, thu ban, phu san
hieu va » hieu qua
cac lao » ca lao, cac loai, cac giao
ban muu » ban muon
muu tre » cuu tre, muu tri
lao va » tao va, cao va, bao va
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (thu san)) ky nang x hoi. ((hieu va) OR (lieu va)) cac lao va doanh ban muu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thu san)) ky nang x hoi. ((hieu va) OR (lieu va)) cac lao va doanh ban muu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (thu san)) ky nang x hoi. ((hieu va) OR (lieu va)) cac lao va doanh ban muu tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thu san)) ky nang x hoi. ((hieu va) OR (lieu va)) cac lao va doanh ban muu tre*.