Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
tang mam » dang mam, mang mam, tang dam
cua tre » cua te, cuu tre, cua triet
tang ma » mang may, tang van
hanh va » hang va, hanh vi
hieu ve » hieu van
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va cua » va chua, via cua, ca cua
te cac » tu cac, ve cac, te cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te cac ky ((tang ma) or (tang mam)) hoi. ((hieu ve) OR (hieu va)) cam thuc va hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ky ((tang ma) OR (tang mam)) hoi. ((hieu ve) OR (hieu va)) cam thuc va hanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cac ky ((tang ma) or (tang mam)) hoi. ((hieu ve) OR (hieu va)) cam thuc va hanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: te cac ky ((tang ma) or (tang mam)) hoi. ((hieu ve) OR (hieu va)) cam thuc va hanh va cua tre*.