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