Perhaps you should try some spelling variations:
danh dong » anh dong, hanh dong, dan dong
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
dong cua » dung cua, cong cua, huong cua
te sach » toc sach
nang ma » tang ma, sang ma, mang may
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet

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

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