Perhaps you should try some spelling variations:
thuc thuc » hoc thuc
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
chat huu » pham huu
hanh dai » hanh tai, hanh dao, vanh dai
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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

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