Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
thanh le » thinh le, thanh ve, thanh de
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu van
hieu va » lieu va, hieu qua
duc van » duc va, duc tan, duc manh
le cua » ly cua
cua te » cua tu

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 ky tang xa hoi. ((hieu ve) or (hieu va)) pham duc van thanh le cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky tang xa hoi. ((hieu ve) OR (hieu va)) pham duc van thanh le cua te.
• Adding a wildcard symbol may retrieve word variants: toc sach ky tang xa hoi. ((hieu ve) or (hieu va)) pham duc van thanh le cua te*.