Pulling multiple items using Index/Match with a wild card search

[mattebe]

I appreciate any help anyone can offer.

Here is what I'm trying to do. I need to compare two worksheets with the goal of identifying all the occurances of data from one sheet and pulling it into another. Here is an abbreviated example.

ReferenceSheet

	A
1	acetaminophen 325mg tablet
2	acetaminophen 500mg tablet
3	acetaminophen 160mg/10.5ml Solution
4	doxepin 10mg capsule
5	doxepin 25mg capsule
6	dopamine IV infusion

<TBODY>
</TBODY>

WorkSheet

	A	B	C	D
1	acetaminophen
2	doxepin
3	dopamine
4	aspirin
5
6

<TBODY>
</TBODY>

What I would like to see happen within the worksheet:

In Row 1, Column B, C, D-each of the three acetaminophen entries from reference table
In Row 2 Column B and C-each of the two doxepin entries from reference table
In Row 3 Column B-the Dopamine entry from reference table
In Row 4 column B-N/A

I have the following equation in the column B which will pull the first insance of the item into the file, but I don't know how to pull the multiple entries. Here is an example of the current formula I would have in worksheet cell B1

=INDEX('referencesheet'!$A$1:$a$5,MATCH("*"&Worksheet!A1&"*",'referencesheet'!$A$1:$A$5,0))