Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
toc sach » hoc sach, doc sach, thuoc sach
vuc nang » cuc nang, vu nang, chuc nang
toi cua » troi cua, tri cua, hoi cua
dan toi » dan toc, dan thi, van toi
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va
va dan » ca dan, va dao, va dau
va cam » va cham, va cao, va cai
x hoi » xa hoi, o hoi, x ho

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)) vuc nang x hoi. hieu ((va cam) or (va cac)) luc va dan toi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuat sach)) vuc nang x hoi. hieu ((va cam) OR (va cac)) luc va dan toi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thuat sach)) vuc nang x hoi. hieu ((va cam) or (va cac)) luc va dan toi cua tre*.