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
chu tre » chu tri, cuu tre, cau tren
cho tre » cho thue, khoe tre
thu ban » thu hang
hieu va » lieu va, hieu qua
cao va » cao van, tao va, co va
ca cao » ca dao, cu cao, ca cac
va ca » va cac, va cao, va cai
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 ca cao va doanh van ((chu tre) OR (cho tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thu ban)) ky nang x hoi. hieu va ca cao va doanh van ((chu tre) OR (cho tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (thu ban)) ky nang x hoi. hieu va ca cao va doanh van ((chu tre) OR (cho tre))".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thu ban)) ky nang x hoi. hieu va ca cao va doanh van ((chu tre) OR (cho tre))*.