There is a limit to what can be achieved by changing margins, as most printer have a non-printing area of about 0.25" around the page edges. So, even with your existing margins, you risk some text being cut off. To minimise the page count you could instead enlarge the page size to double or even four times what you now have, with or without a multi-column layout, save as a PDF, then open the file in Acrobat Reader and use its page-scaling function to down-scale the output to fit your actual paper.

You can also reduce page counts by using more compact fonts (eg Arial Narrow) and point sizes, along with reducing line and paragraph spacing. For example, text that spans 6 pages in 12pt Arial with single line spacing and 12pt paragraph before spacing, spans only 3.5 pages in 11pt Arial Narrow with 0.85 line spacing and 6pt paragraph before spacing.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]