Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
vat cuu » vat cua
dan vat » dang vat, van vat, dan va
thuc va » thuc vat, thuc dan, thuc day
cuu tre » cua tre, cau tren, cau treo
y lang » o lang, _ lang, tay lang
va nay » va ngay, va cay
va dan » ca dan, va dao, va dau
ha hoi » hoa hoi, xa hoi, va hoi
va nam » van nam, ha nam

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y lang ((ha hoi) OR (ha noi)). hieu ((va nam) OR (va nay)) thuc va dan vat cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y lang ((ha hoi) OR (ha noi)). hieu ((va nam) or (va nay)) thuc va dan vat cuu tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach y lang ((ha hoi) OR (ha noi)). hieu ((va nam) or (va nay)) thuc va dan vat cuu tre*.