Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
qua cac » cua cac
cac xuc » cam xuc, cac nuoc, chat xuc
va hanh » va thanh, va danh, dao hanh
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty nang xa hoi. hieu qua cac xuc ((((va hanh) OR (ban hanh))) or (van hanh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang xa hoi. hieu qua cac xuc ((((va hanh) OR (ban hanh))) OR (van hanh)) di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang xa hoi. hieu qua cac xuc ((((va hanh) OR (ban hanh))) or (van hanh)) di cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang xa hoi. hieu qua cac xuc ((((va hanh) OR (ban hanh))) or (van hanh)) di cua tre*.