Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
dan thanh » dang thanh, danh thanh, ban thanh
thuc dan » thuc hanh, hoc dan, thuc vat
cam thuc » am thuc, nam thuc, cam thu
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
tang ma » tang van
nang ma » sang ma, nang cao
nam ky » cam ky, nam ly
ve cam » ve cham, ve cac, va cam
tu nam » su nam

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 nam ky ((nang ma) OR (((tang ma) OR (mang may)))) hoi. hieu ve cam thuc dan thanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu nam ky ((nang ma) or (((tang ma) OR (mang may)))) hoi. hieu ve cam thuc dan thanh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu nam ky ((nang ma) or (((tang ma) OR (mang may)))) hoi. hieu ve cam thuc dan thanh vai cua tre*.