Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
te sach » toc sach
hanh de » hanh ve, hanh kem
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
sach tu » sach thu, cach tu, sach ty
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
ve nam » he nam, va nam, le nam
cua tu » cua tuc, cua su, cua cu

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

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