Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
thanh le » thinh le, thanh ve, thanh de
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
va cao » va cac, va dao, va bao
le cua » ly cua
cua te » cua tu
va co » vo co

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 lang ((van hoc) or (van hoa)). lieu ((va cao) OR (va co)) hoc va thanh le cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky lang ((van hoc) OR (van hoa)). lieu ((va cao) OR (va co)) hoc va thanh le cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky lang ((van hoc) or (van hoa)). lieu ((va cao) OR (va co)) hoc va thanh le cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach ky lang ((van hoc) or (van hoa)). lieu ((va cao) OR (va co)) hoc va thanh le cua te*.