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 treo » cau theo, cau tren, cau triet
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
va dan » ca dan, va dau, va dap
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 ((va dan) or (va dao)) vai cau treo~.
• 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 ((va dan) OR (va dao)) vai cau treo.
• 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 ((va dan) or (va dao)) vai cau treo".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (thuoc sach)) ky lang xa hoi. hieu van cau xuc ((va dan) or (va dao)) vai cau treo*.