Perhaps you should try some spelling variations:
van trieu » tan trieu, van tieu, van hieu
cay thuc » cay thuoc, can thuc, day thuc
sach van » sach han, sach va, bach van
hieu van » thien van, lieu va, hieu ve
nang ma » tang ma, sang ma, mang may
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
te sach » toc sach

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach van ((nang ma) OR (nang cao)) hoi. ((hieu van) OR (hieu va)) cay thuc va danh vi van trieu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach van ((nang ma) OR (nang cao)) hoi. ((hieu van) or (hieu va)) cay thuc va danh vi van trieu~".
• Adding a wildcard symbol may retrieve word variants: te sach van ((nang ma) OR (nang cao)) hoi. ((hieu van) or (hieu va)) cay thuc va danh vi van trieu*.