Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cau treo » cau theo, cau tren, cau triet
lang xa » dang xay, lang van
lang ha » long ha
thuc va » thuc vat, thuc dan, thuc day
va nam » ha nam, va nay
va dan » ca dan, va dao, va dau
dan va » doan va, dan ca, ban va
va cau » van cau, va cac, 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 y ((lang xa) or (lang ha)) hoi. hieu ((va nam) OR (van nam)) thuc va dan va cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y ((lang xa) OR (lang ha)) hoi. hieu ((va nam) OR (van nam)) thuc va dan va cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y ((lang xa) or (lang ha)) hoi. hieu ((va nam) OR (van nam)) thuc va dan va cau treo".
• Adding a wildcard symbol may retrieve word variants: toc sach y ((lang xa) or (lang ha)) hoi. hieu ((va nam) OR (van nam)) thuc va dan va cau treo*.