Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
ban benh » san benh, ba benh, ban banh
tu sach » thu sach, su sach, tu cach
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
xuc ban » duc ban, cuc ban, quoc ban
benh vi » benh va, benh ve, benh li
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((tu sach) OR (te sach))) or (toc sach)) ky nang xa hoi. hieu van cam xuc ban benh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (te sach))) OR (toc sach)) ky nang xa hoi. hieu van cam xuc ban benh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((tu sach) OR (te sach))) or (toc sach)) ky nang xa hoi. hieu van cam xuc ban benh vi cua tre*".