Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
thai cua » than cua, tai cuc, tri cua
sach bai » sach dao, cac bai, sach xa
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
sach ki » sach kinh, sach kem, sach doi
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve nam » he nam, va nam, le nam
ma hoi » mai hoi, xa hoi, ma hoa
di cua » dai cua, doi cua, de cua

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