Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
hanh doi » thanh doi, hanh noi, hang doi
te sach » toc sach
tang ma » mang may, tang van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
doi cua » dai cua, hoi cua, dong cua
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 ((tang ma) or (nang cao)) hoi. hieu van nam thuc va hanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((tang ma) OR (nang cao)) hoi. hieu van nam thuc va hanh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach y ((tang ma) or (nang cao)) hoi. hieu van nam thuc va hanh doi cua tre*.