Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
van thanh » ban thanh, van tuan
te sach » toc sach
sach ky » sac ky, sach y, sach ty
tai cua » thai cua, tai cuc, tri cua
cao duc » dao duc, cao suc, giao duc
hieu va » lieu va, hieu qua
hieu ve » hieu van
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
cua tu » cua tuc, cua su, cua cu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ma hoi. ((hieu ve) OR (hieu va)) ((pham duc) OR (cao duc)) van thanh tai cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ma hoi. ((hieu ve) OR (hieu va)) ((pham duc) or (cao duc)) van thanh tai cua tu~".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ma hoi. ((hieu ve) OR (hieu va)) ((pham duc) or (cao duc)) van thanh tai cua tu*.