Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hanh dai » hanh tai, hanh dao, vanh dai
va cham » va chat, va tham
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
doc va » duoc va, hoc va, duc va
loc va » hoc va, luc va
x hoi » xa hoi, o hoi, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach y nang ((x hoi) or (x ho)). lieu va cham ((doc va) or (loc va)) hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y nang ((x hoi) OR (x ho)). lieu va cham ((doc va) OR (loc va)) hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: thuat sach y nang ((x hoi) or (x ho)). lieu va cham ((doc va) or (loc va)) hanh dai cua tre*.