Well, yours has a typo--it's ' miracle ', not 'mircale'. any number of miracle cures = many medicines/therapies/etc which have no convincing scientific proof of efficacy but which are strongly believed in or commercially hyped.
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What does 'any number of mircale cures' mean?It means 'as many or as few as you might wish to consider, since there are such a large number of them, and they all have essentially the same characteristics'. It means 'all sorts of, take your pick'.