Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
sach dat » sach dao, sach danh, sach bai
sach dai » sach dao, sach bai, sach dau
lang di » lang dai, hang di, lang du
va lang » va nang, hoa lang
thuc va » thuc vat, thuc dan, thuc day
mai hoi » mai khoi, dai hoi, lai hoi
di cua » dai cua, doi cua, de cua
va nam » van nam, ha nam, va nay

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: tu ((sach dai) OR (sach dat)) nang ((xa hoi) OR (mai hoi)). lieu va nam thuc va lang di cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach dai) OR (sach dat)) nang ((xa hoi) or (mai hoi)). lieu va nam thuc va lang di cua vat~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach dai) OR (sach dat)) nang ((xa hoi) or (mai hoi)). lieu va nam thuc va lang di cua vat*.