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

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