Perhaps you should try some spelling variations:
nay thuc » nam thuc, cay thuc, day thuc
sach tu » sach thu, cach tu, sach ty
nang xa » nang x, lang xa, nang ma
thuc va » thuc vat, thuc dan, thuc day
va doan » va doanh, van doan, va dan
doan vi » doan va, don vi, doan thi
cua tre » cua te, cuu tre, cua triet
va nay » va ngay, va cay
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach tu) or (sach y)) ((nang xa) or (van xay)) hoi. lieu va nay thuc va doan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach tu) OR (sach y)) ((nang xa) OR (van xay)) hoi. lieu va nay thuc va doan vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach tu) or (sach y)) ((nang xa) or (van xay)) hoi. lieu va nay thuc va doan vi cua tre*.