Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
sach nay » sach hay, sach vay, sach nang
danh hai » dang hai, lanh hai, manh hai
lam thuc » lam thuoc, am thuc, nam thuc
hieu van » hieu va, thien van, lieu va
sang ma » tang ma, nang ma, sang tao
sach ty » sach y, sach tu, sach thu
van lam » van nam
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
hai cau » hai chau, hai chu, hai hau
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach nay) or (sach ty)) sang ma hoi. hieu van lam thuc va danh hai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach nay) OR (sach ty)) sang ma hoi. hieu van lam thuc va danh hai cau tren.
• Adding a wildcard symbol may retrieve word variants: su ((sach nay) or (sach ty)) sang ma hoi. hieu van lam thuc va danh hai cau tren*.