Perhaps you should try some spelling variations:
lam thuc » lam thuoc, am thuc, nam thuc
lang van » dang van, tang van, hoang van
van hanh » van thanh, ban hanh, van anh
dang xay » dang van, van xay
thuc van » thuc vat, thuc dan, thuc va
tu sach » thu sach, su sach, te sach
hanh di » hanh vi, hanh de, hang di
cau tre » cau tren, cau treo, cau tra
sach ky » sac ky, sach y, sach ty
hieu va » hieu qua
di cau » da cau, diem cau

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 ky ((lang van) or (dang xay)) hoi. ((hieu va) OR (lieu va)) lam thuc van hanh di cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((lang van) OR (dang xay)) hoi. ((hieu va) OR (lieu va)) lam thuc van hanh di cau tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((lang van) or (dang xay)) hoi. ((hieu va) OR (lieu va)) lam thuc van hanh di cau tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((lang van) or (dang xay)) hoi. ((hieu va) OR (lieu va)) lam thuc van hanh di cau tre*.