Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » thien van, lieu va, hieu ve
cam thuc » am thuc, nam thuc, cam thu
va doanh » van doanh, vay doanh, va danh
sach ki » sach kinh, sach bai, sach kem
ki nang » ky nang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ki nang xa hoi. ((hieu van) OR (hieu va)) cam thuc va doanh tai cuu tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach ki nang xa hoi. ((hieu van) OR (hieu va)) cam thuc va doanh tai cuu tre*.