Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
nang xay » dang xay, nganh xay, nang xuan
cam luc » cam xuc
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cau luc » cau truc, cau phuc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi

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) or (toc sach)) ky nang xay hoi. hieu ve ((cam luc) or (cau luc)) va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky nang xay hoi. hieu ve ((cam luc) OR (cau luc)) va hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky nang xay hoi. hieu ve ((cam luc) or (cau luc)) va hanh vai cua tre*.