Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
xuc van » duc van, luc van, vuc van
cua tre » cua te, cuu tre, cua triet
va nay » va ngay, va cay
vi cua » vai cua, di cua
o hoi » co hoi, o hai, o hoa
o hoc » co hoc, mo hoc, so hoc

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

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