Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach kem
danh di » danh du, xanh di, danh dien
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
sach ty » sach y, sach tu, sach thu
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: thu ((sach ky) or (sach ty)) ((nang xa) or (nang ma)) hoi. hieu van nam thuc va danh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach ty)) ((nang xa) OR (nang ma)) hoi. hieu van nam thuc va danh di cua tre.
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sach ty)) ((nang xa) or (nang ma)) hoi. hieu van nam thuc va danh di cua tre*.