Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
so sanh » do sanh
tang ma » mang may, tang van
qua cam » qua cham, qua cac, qua ca
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
so sach » bo sach, co sach, hoc sach
y tang » ky tang, 6 tang, 7 tang
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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: ((so sach) OR (so sanh)) y tang ma hoi. hieu qua cam thuc va hanh ((vi cua) OR (di cua)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (so sanh)) y tang ma hoi. hieu qua cam thuc va hanh ((vi cua) OR (di cua)) triet~".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (so sanh)) y tang ma hoi. hieu qua cam thuc va hanh ((vi cua) OR (di cua)) triet*.