Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
hieu van » hieu va, thien van, lieu va
cau tren » cu tren, dau tren, ca tren
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cau xuc » cam xuc, cau luc, cau truc
vai cau » va cau, vai cac, lai chau
van cau » van dau, van hau, van chat
ca dan » cac dan, ca dao
va dao » ca 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) OR (thuoc sach)) ky lang xa hoi. hieu van cau xuc ((ca dan) or (va dao)) vai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuoc sach)) ky lang xa hoi. hieu van cau xuc ((ca dan) OR (va dao)) vai cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (thuoc sach)) ky lang xa hoi. hieu van cau xuc ((ca dan) or (va dao)) vai cau tren".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (thuoc sach)) ky lang xa hoi. hieu van cau xuc ((ca dan) or (va dao)) vai cau tren*.