Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
sach ty » sach tu, sach thu, xach tay
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 nam » van nam, ha nam, va nay
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 ty) or (sach y)) ((nang xa) or (van xay)) hoi. lieu va nam thuc va doan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) ((nang xa) OR (van xay)) hoi. lieu va nam thuc va doan vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach y)) ((nang xa) or (van xay)) hoi. lieu va nam thuc va doan vi cua tre*.