Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
toc sach » hoc sach, doc sach, thuoc sach
trung va » truong va, trang va, trung ha
truc va » thuc va, thuc vat
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
va cham » va chat, va tham
va cao » va cac, va co, va dao
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 cham) or (va cao)) ((truc va) OR (trung va)) thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang x hoi. hieu ((va cham) OR (va cao)) ((truc va) OR (trung va)) thanh dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang x hoi. hieu ((va cham) or (va cao)) ((truc va) OR (trung va)) thanh dai cua tre*".