Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
tai cua » thai cua, tai cuc, tri cua
va hanh » van hanh, va danh, ban hanh
van cam » van nam, van lam, van cau
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
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: ((tu sach) or (toc sach)) ky nang o hoi. hieu van cam xuc ((va hanh) or (va thanh)) tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ky nang o hoi. hieu van cam xuc ((va hanh) OR (va thanh)) tai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ky nang o hoi. hieu van cam xuc ((va hanh) or (va thanh)) tai cua tre*.