Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
than duc » tran duc, phan duc, than doc
cua viet » ca viet, hoa viet, cua vat
hieu va » lieu va, hieu qua
va than » va thanh, van than, va phan
van anh » tuan anh, van minh
hai cua » thai cua, dai cua, hoi cua
y nang » ky nang, ly nang, v nang
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 y nang x hoi. hieu va than duc ((van anh) or (van thanh)) hai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang x hoi. hieu va than duc ((van anh) OR (van thanh)) hai cua viet.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang x hoi. hieu va than duc ((van anh) or (van thanh)) hai cua viet*.