Perhaps you should try some spelling variations:
"housing and human habits" » "housing and human hybrids", "housing and human hair", "housing and human hearts", "focusing and human habits"
"housing and human habitats" » "focusing and human habitats"
"housing and human habitat" » "focusing and human habitat"

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: (((("housing and human habitats") OR ("housing and human habitat"))) OR ("housing and human habits")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"housing and human habitats\") OR (\"housing and human habitat\"))) or (\"housing and human habits\"))".
• Removing quotes may allow a broader search: (((( housing and human habitats ) OR ( housing and human habitat ))) or ( housing and human habits )).
• Adding a wildcard symbol may retrieve word variants: (((("housing and human habitats") OR ("housing and human habitat"))) or ("housing and human habits"))*.