Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
thu sach » tu sach, thuat sach, thuoc sach
thu san » thuy san, thu ban, phu san
hieu va » lieu va, hieu qua
van cuu » van cau, van chu, van cu
cuu tre » cua tre, cau tren, cau treo
lao va » cao va, bao va, dao 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 cac ((lao va) OR (tao va)) doanh van cuu 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 cac ((lao va) OR (tao va)) doanh van cuu 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 cac ((lao va) OR (tao va)) doanh van cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thu san)) ky nang x hoi. hieu va cac ((lao va) OR (tao va)) doanh van cuu tre*.