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