Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
nam thuc » nam thuoc, am thuc, nam thu
danh doi » danh di, thanh doi, dung doi
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
doi cua » dai cua, hoi 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 ((nang ma) or (nang cao)) hoi. ((hieu van) OR (thien van)) nam thuc va danh doi 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) OR (thien van)) nam thuc va danh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((nang ma) or (nang cao)) hoi. ((hieu van) OR (thien van)) nam thuc va danh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang ma) or (nang cao)) hoi. ((hieu van) OR (thien van)) nam thuc va danh doi cua tre*.