Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
va hanh » van hanh, va danh, ban hanh
cac tuc » cac toc, cac tu, cac tac
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
vi cua » vai cua, di cua
ve cac » va cac, vien cac
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang ((xa hoi) or (o hoi)). hieu ve cac tuc ((va hanh) or (va thanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ((xa hoi) OR (o hoi)). hieu ve cac tuc ((va hanh) OR (va thanh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ((xa hoi) or (o hoi)). hieu ve cac tuc ((va hanh) or (va thanh)) vi cua tre*.