Perhaps you should try some spelling variations:
"surface and interfaces, thick films" » "surface and interfaces, thin films", "surface and interfaces, thick files"
"surface and interfaces, thick film" » "surface and interfaces, thick file"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"surface and interfaces, thick films\") OR (\"surface and interfaces, thick film\"))".
• Removing quotes may allow a broader search: (( surface and interfaces, thick films ) OR ( surface and interfaces, thick film )).
• Adding a wildcard symbol may retrieve word variants: (("surface and interfaces, thick films") OR ("surface and interfaces, thick film"))*.