Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh dai » thanh hai, thanh tai, thanh dat
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
te sach » toc sach
van cau » van dau, van hau, van chat
cau tuc » cau truc, cau tu, cau luc
tuc van » thuc van, truc van, tuc va
ma hoi » mai hoi, ma hoa, me hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (hoc sach)) ky nang ((ma hoi) or (xa hoi)). hieu van cau tuc van thanh dai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (hoc sach)) ky nang ((ma hoi) OR (xa hoi)). hieu van cau tuc van thanh dai cua vat.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (hoc sach)) ky nang ((ma hoi) or (xa hoi)). hieu van cau tuc van thanh dai cua vat*.