Perhaps you should try some spelling variations:
"das original references" » "das origin references", "das kriging references", "das original defences", "his original references", "its original references"
"early origins references" » "early origin references", "early horizons references", "early proteins references"
"ear resins references" » "ear lesions references", "ear designs references", "ear results references", "ear regions references", "ester resins references"
"das marginal references" » "sas marginal references", "data marginal references", "a marginal references"

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: (((("das original references") OR ("das marginal references"))) OR ((("ear resins references") OR ("early origins references")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"das original references\") OR (\"das marginal references\"))) or (((\"ear resins references\") or (\"early origins references\"))))".
• Removing quotes may allow a broader search: (((( das original references ) OR ( das marginal references ))) or ((( ear resins references ) or ( early origins references )))).
• Adding a wildcard symbol may retrieve word variants: (((("das original references") OR ("das marginal references"))) or ((("ear resins references") or ("early origins references"))))*.