Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ban hang » ngan hang
van chat » cao chat
ve chat » va chat
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cuu tre » cua tre, cau tren, cau treo
de cuu » 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 ((ve chat) or (van chat)) xuc ((ban hanh) OR (ban hang)) de cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang xa hoi. hieu ((ve chat) OR (van chat)) xuc ((ban hanh) OR (ban hang)) de cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang xa hoi. hieu ((ve chat) or (van chat)) xuc ((ban hanh) OR (ban hang)) de cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang xa hoi. hieu ((ve chat) or (van chat)) xuc ((ban hanh) OR (ban hang)) de cuu tre*.