Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cam luc » cam xuc, cau luc
va hang » van hang, va nang, va hanh
va lang » va nang, hoa lang
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
y dang » ky dang, 2 dang, b dang
_ dang » _ dan, 2 dang, _ 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: toc sach ((y dang) OR (_ dang)) xa 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: toc sach ((y dang) OR (_ dang)) xa 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: "toc sach ((y dang) OR (_ dang)) xa hoi. lieu va cam luc ((va hang) or (va lang)) tai cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ((y dang) OR (_ dang)) xa hoi. lieu va cam luc ((va hang) or (va lang)) tai cua tre*.