Perhaps you should try some spelling variations:
sang tao » hang tai
tao khoi » tao hoi, thao khoa, lao khoa
cam thuc » am thuc, nam thuc, cam thu
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
vi cua » vai cua, di 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: te sach ky sang tao khoi. ((hieu ve) OR (hieu qua)) cam thuc va danh vi cua vat~.
• Adding a wildcard symbol may retrieve word variants: te sach ky sang tao khoi. ((hieu ve) or (hieu qua)) cam thuc va danh vi cua vat*.