Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
ban thanh » ban hanh, ban hang
hoc sach » hoc sinh, hoc cac, hoc anh
truc ban » thuc ban, truc dan, truc van
va chat » van chat, va phat, cao chat
dat cua » dai cua, day cua, mat cua
cua tre » cua te, cuu tre, cua triet
mai hoi » mai khoi, dai hoi, lai hoi
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach y nang ((xa hoi) or (mai hoi)). hieu ((va cam) or (va chat)) truc ban thanh dat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y nang ((xa hoi) OR (mai hoi)). hieu ((va cam) OR (va chat)) truc ban thanh dat cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach y nang ((xa hoi) or (mai hoi)). hieu ((va cam) or (va chat)) truc ban thanh dat cua tre*.