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 ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
dan vat » dang vat, van vat, dan va
vat cau » dat cau, va cau, van cau
hieu va » lieu va
va dan » ca dan, va dao, va dau

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