Perhaps you should try some spelling variations:
dau thuc » dan thuc, dai thuc, dam thuc
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
va caua » va chua
sac ky » cac ky, sai ky
va dau » va dao
va cau » van cau, va cac, 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: tu ((sach ty) or (sac ky)) nang xa hoi. hieu va dau thuc va hanh ((va caua) or (va cau)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sac ky)) nang xa hoi. hieu va dau thuc va hanh ((va caua) OR (va cau)) triet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sac ky)) nang xa hoi. hieu va dau thuc va hanh ((va caua) or (va cau)) triet*.