Perhaps you should try some spelling variations:
"racial differentes situations" » "racial different situations", "racial difference equations", "racial differences situations", "crucial differences situations", "facial difference situations"
"social differences situations" » "social different situations", "social difference simulations", "social differences equations", "racial differences situations", "social preferences situations", "regional differences situations"
"racial difference equation" » "racial difference equations", "racial differential equation", "racial differential equations", "racial differences equation", "facial difference equation", "social difference equation"

Try widening your search to All Fields.

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: (((("racial differentes situations") OR ("social differences situations"))) OR ("racial difference equation")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"racial differentes situations\") OR (\"social differences situations\"))) or (\"racial difference equation\"))".
• Removing quotes may allow a broader search: (((( racial differentes situations ) OR ( social differences situations ))) or ( racial difference equation )).
• Adding a wildcard symbol may retrieve word variants: (((("racial differentes situations") OR ("social differences situations"))) or ("racial difference equation"))*.