Perhaps you should try some spelling variations:
"global perspectives on health demography" » "global perspective on health demography", "global perspectives on health demographic"
"global perspectives on health tomography" » "global perspective on health tomography", "global perspectives on health geography", "global perspectives on head tomography", "global perspectives on health demographic"

Try widening your search to All Fields.

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: "((\"global perspectives on health demography\") OR (\"global perspectives on health tomography\"))".
• Removing quotes may allow a broader search: (( global perspectives on health demography ) OR ( global perspectives on health tomography )).
• Adding a wildcard symbol may retrieve word variants: (("global perspectives on health demography") OR ("global perspectives on health tomography"))*.