Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va ban » van ban, va bai, va bao
ban so » ban do, ban co, ban bo
so van » su van, vo van
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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 ho. hieu va ban so van thanh ((vi cua) or (di cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x ho. hieu va ban so van thanh ((vi cua) OR (di cua)) viet.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x ho. hieu va ban so van thanh ((vi cua) or (di cua)) viet*.