Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va thanh » ban thanh, va tinh, le thanh
dat cuu » dat cau, dat cua
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
va tham » van tham, va cham, va thuat
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
va cao » va cac, va co, va dao

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 dang xa hoi. hieu ((va tham) or (va cao)) truc ((va thanh) OR (gia thanh)) dat cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang xa hoi. hieu ((va tham) OR (va cao)) truc ((va thanh) OR (gia thanh)) dat cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky dang xa hoi. hieu ((va tham) or (va cao)) truc ((va thanh) OR (gia thanh)) dat cuu tre*".