Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
toc sach » hoc sach, doc sach, thuoc sach
dang xay » dang van, van xay
va hanh » van hanh, va thanh, va danh
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
ve cac » vien cac
xuc va » duc va, tuc va, luc va

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 dang xay hoi. hieu ((ve cac) OR (va cac)) xuc va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky dang xay hoi. hieu ((ve cac) OR (va cac)) xuc va hanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ky dang xay hoi. hieu ((ve cac) OR (va cac)) xuc va hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky dang xay hoi. hieu ((ve cac) OR (va cac)) xuc va hanh dai cua tre*.