Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va hanh, dia danh
cac loc » cac lop, cac toc, cac hoc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ly hang » ly quang
ty nang » ky nang, ty xang, ty hang
va dan » ca dan, va dao, va dau
ve cac » va cac, vien cac
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: thu sach ((ty nang) or (ly hang)) x hoi. hieu ve cac loc ((va danh) OR (va dan)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ty nang) OR (ly hang)) x hoi. hieu ve cac loc ((va danh) OR (va dan)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ty nang) or (ly hang)) x hoi. hieu ve cac loc ((va danh) OR (va dan)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ty nang) or (ly hang)) x hoi. hieu ve cac loc ((va danh) OR (va dan)) vai cua tre*.