Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
cua tre » cuu tre, cua triet, dua tren
hanh ve » hanh vi, hanh va, hanh kem
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
ve cam » ve cham, ve cac, va cam
bai ky » ban ky, sai ky, dai ky
ma hoi » mai hoi, xa hoi, ma hoa
bac ky » cac ky, ban ky, sac ky
cua te » cua tu

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: tu ((bai ky) OR (bac ky)) nang ma hoi. hieu ve cam thuc va hanh ve ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((bai ky) or (bac ky)) nang ma hoi. hieu ve cam thuc va hanh ve ((cua tre) OR (cua te))~".
• Adding a wildcard symbol may retrieve word variants: tu ((bai ky) or (bac ky)) nang ma hoi. hieu ve cam thuc va hanh ve ((cua tre) OR (cua te))*.