Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cau thuc » cau truc, cuu thuc, can thuc
co sach » bo sach, cuon sach, hoc sach
lang xa » lang ha, dang xay, lang van
nang ma » tang ma, sang ma, nang cao
van cau » van dau, van hau, van chat
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
danh di » danh du, xanh di, danh dien
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: co sach y ((lang xa) or (nang ma)) hoi. hieu van cau thuc va danh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach y ((lang xa) OR (nang ma)) hoi. hieu van cau thuc va danh di cua tre.
• Adding a wildcard symbol may retrieve word variants: co sach y ((lang xa) or (nang ma)) hoi. hieu van cau thuc va danh di cua tre*.