Perhaps you should try some spelling variations:
australian politician » australian political, australian politics, australia political
robert walser » robert walker, robert watson, robert winter
robert warren » robert watson

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((robert walser) OR (robert warren)) (australian politician)".
• Adding a wildcard symbol may retrieve word variants: ((robert walser) OR (robert warren)) (australian politician)*.