Hi Sami,
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For this particular case, you're doing things in the wrong order. You will want to put your "&a/&b/&c" assignations outside the Search loop. Inside the Search should be only your array building and the incrementation of your array index (&i:=&i+1).
Then once the Search loop is done, you will still want to do one last assignation to your array because the last results of the Search is accessible only after the Search loop code. Then you will simply do &a:=&FieldsArray[x],&b:=&FieldsArray[y] etc...pointing only on the specific fieldArray indexes you need for these variables.
If you always have a static amount of words to extract, and a static amount of words in your paragraph, then the Search loop is not required and this is overkill. If there could be any number of words in your paragraph, then the Search loop is good, but then you will not be able to point on static index positions from your FieldsArray to populate a-b and c...I feel this post is missing information/context so we can properly guide you.
Hope this still helps get the expected result.