Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang xay » dang van, van xay
cam luc » cam xuc, cau luc
tai cua » thai cua, tai cuc, tri cua
va lang » va nang, hoa lang
va hang » van hang, va nang, va hanh
cua tre » cua te, cuu tre, cua triet
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
va cam » va cham, va cac, va cao

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