Perhaps you should try some spelling variations:
dang thanh » dong thanh, dang hanh, hoang thanh
thuc dang » thuoc dang, thuc dan, thuc dung
cam thuc » am thuc, nam thuc, cam thu
sanh ky » hanh ky, sang ky, nganh ky
ca chua » ca cua, sua chua
so sanh » do sanh
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
va cua » va chua, via cua, ca cua
ve cam » ve cham, ve cac, va cam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh ky ((nang ma) or (tang ma)) hoi. hieu ve cam thuc dang thanh ((va cua) or (ca chua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ky ((nang ma) OR (tang ma)) hoi. hieu ve cam thuc dang thanh ((va cua) OR (ca chua)) tre.
• Adding a wildcard symbol may retrieve word variants: so sanh ky ((nang ma) or (tang ma)) hoi. hieu ve cam thuc dang thanh ((va cua) or (ca chua)) tre*.