Perhaps you should try some spelling variations:
bao thuc » cao thuoc, am thuc, va thuc
te sach » toc sach
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
sach tu » sach thu, cach tu, sach ty
qua bao » qua ban, qua bau, qua lao
mang xa » lang xa, mang may, dang xay
va cau » van cau, va dau, va cao

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 tu ((mang xa) or (nang x)) hoi. hieu qua bao thuc va hanh ((va cau) OR (va cac)) tra~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu ((mang xa) OR (nang x)) hoi. hieu qua bao thuc va hanh ((va cau) OR (va cac)) tra.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu ((mang xa) or (nang x)) hoi. hieu qua bao thuc va hanh ((va cau) OR (va cac)) tra".
• Adding a wildcard symbol may retrieve word variants: te sach tu ((mang xa) or (nang x)) hoi. hieu qua bao thuc va hanh ((va cau) OR (va cac)) tra*.