Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo
cau xuc » cam xuc, cau luc, cau truc
van cau » van dau, van hau, van chat
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
va dan » ca dan, va dau, va dap

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 xa hoi. hieu van cau xuc ((va dan) or (((va dao) OR (ca dao)))) vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky lang xa hoi. hieu van cau xuc ((va dan) OR (((va dao) OR (ca dao)))) vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky lang xa hoi. hieu van cau xuc ((va dan) or (((va dao) OR (ca dao)))) vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ky lang xa hoi. hieu van cau xuc ((va dan) or (((va dao) OR (ca dao)))) vai cuu tre*.