Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
toc sach » hoc sach, doc sach, thuoc sach
hanh dai » hanh tai, hanh dao, vanh dai
va hanh » van hanh, va thanh, va danh
xay hoi » xa hoi, tay hoi, cay phoi
cua tre » cua te, cuu tre, cua triet
ve cac » vien cac
ky van » ly van, ty van, ky va
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: ((toc sach) or (thuat sach)) ky van 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: ((toc sach) OR (thuat sach)) ky van xay hoi. hieu ((ve cac) OR (va cac)) xuc va hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thuat sach)) ky van xay hoi. hieu ((ve cac) or (va cac)) xuc va hanh dai cua tre*.