Perhaps you should try some spelling variations:
can thuc » dan thuc, van thuc, cay thuc
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hai cua » thai cua, hoi cua, lai cua
tu can » tu ban, tu cac, thu canh
can ky » van ky, dan ky, ban ky
ma hoi » mai hoi, xa hoi, ma hoa
va can » va chan, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu can ky nang ma hoi. hieu va can thuc va hanh ((hai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu can ky nang ma hoi. hieu va can thuc va hanh ((hai cua) OR (dai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu can ky nang ma hoi. hieu va can thuc va hanh ((hai cua) or (dai cua)) tre*.