Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
thanh tai » thanh toan, doanh tai, thanh san
lam thuc » lam thuoc, am thuc, nam thuc
lang mai » lang dai, lang hai, lang man
hieu van » hieu va, thien van, lieu va
van lam » van nam
thuc va » thuc vat, thuc dan, thuc day
mai hoi » mai khoi, dai hoi, lai hoi
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach y) or (sac ky)) lang mai hoi. hieu van lam thuc va ((thanh hai) or (thanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach y) OR (sac ky)) lang mai hoi. hieu van lam thuc va ((thanh hai) OR (thanh tai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (sac ky)) lang mai hoi. hieu van lam thuc va ((thanh hai) or (thanh tai)) cua tre*.