Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
thu sach » tu sach, thuat sach, thuoc sach
va doanh » van doanh, vay doanh, va danh
cau tren » cu tren, dau tren, ca tren
hieu va » lieu va, hieu qua
thu ban » thu hang
cuu tre » cua tre, cau treo
cac lao » ca lao, cac loai, cac giao
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 ban)) ky nang x hoi. hieu va cac lao va doanh van ((cuu tre) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thu ban)) ky nang x hoi. hieu va cac lao va doanh van ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (thu ban)) ky nang x hoi. hieu va cac lao va doanh van ((cuu tre) OR (cau tren))".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thu ban)) ky nang x hoi. hieu va cac lao va doanh van ((cuu tre) OR (cau tren))*.