Perhaps you should try some spelling variations:
"random wallets" » "random walkers", "random waves", "random alloys"
"random wales" » "random waves", "random walkers", "random walker"
"random walks" » "random talks", "random walk"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("random walks") OR ((("random wales") OR ("random wallets")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"random walks\") or (((\"random wales\") OR (\"random wallets\"))))".
• Removing quotes may allow a broader search: (( random walks ) or ((( random wales ) OR ( random wallets )))).
• Adding a wildcard symbol may retrieve word variants: (("random walks") or ((("random wales") OR ("random wallets"))))*.