Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
lang van » dang van, tang van, hoang van
nam thuc » nam thuoc, am thuc, nam thu
cau treo » cau theo, cau tren, cau triet
lang xa » lang ha, dang xay
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
dao vai » dao van, dao va, dao bai
vai cau » va cau, van cau, vai cac
va nam » van nam, ha nam, va nay
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 ty ((lang xa) or (lang van)) hoi. hieu va nam thuc va dao vai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty ((lang xa) OR (lang van)) hoi. hieu va nam thuc va dao vai cau treo.
• Adding a wildcard symbol may retrieve word variants: toc sach ty ((lang xa) or (lang van)) hoi. hieu va nam thuc va dao vai cau treo*.