Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
cac tuc » cac toc, cac tu, cac tac
tuc van » thuc van, truc van, tuc va
dai cuu » dai huu

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 ty nang xa hoi. lieu va cac tuc van hanh ((dai cuu) OR (dai cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang xa hoi. lieu va cac tuc van hanh ((dai cuu) OR (dai cua)) tre*.