Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
trung va » truong va, trang va, trung ha
danh dai » danh dau, danh di, danh sai
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
va cau » van cau, va cac, va dau
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 ky nang x hoi. hieu ((va cau) or (((van chat) OR (cao chat)))) trung va danh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang x hoi. hieu ((va cau) OR (((van chat) OR (cao chat)))) trung va danh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang x hoi. hieu ((va cau) or (((van chat) OR (cao chat)))) trung va danh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang x hoi. hieu ((va cau) or (((van chat) OR (cao chat)))) trung va danh dai cua tre*.