First of all, it's entirely possible you don't need the find function. Unless you actually need the indices of the element that match your condition, you're better off simply using logical indexing.
Secondly, to find something that matches multiple conditions, you simply use logical operators to combine theses conditions. Finally, to find if a number is a multiple of another, you simply divide the former by the latter and see if the remainder is 0. The function to get the remainder is rem ( mod also works). So, to get the elements of x that are multiple of 3 AND NOT multiple of 2:
x(rem(x, 3) == 0 && rem(x, 2) ~= 0)
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