Perhaps you should try some spelling variations:
vay doanh » van doanh, ly doanh, voi doanh
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
thuc vay » thuc vat, thuc day, thuc va
doanh va » doan va, doanh tai, doanh cua
chua tre » chua tri, cua tre, chua trieu
te sach » toc sach
lang ha » long ha
va chua » vua chua, ca chua, va chu

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 ((lang ha) or (hang va)) hoi. hieu van nam thuc vay doanh va chua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((lang ha) OR (hang va)) hoi. hieu van nam thuc vay doanh va chua tre.
• Adding a wildcard symbol may retrieve word variants: te sach y ((lang ha) or (hang va)) hoi. hieu van nam thuc vay doanh va chua tre*.