Perhaps you should try some spelling variations:
"surface and surface science, tin films" » "surface and surface science, thin films", "surface and surface science, n films"
"surface and surface science, 6 films" » "surface and surface science, _ films", "surface and surface science, 6 film", "surface and surface science, 4 films"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("surface and surface science, tin films") OR ("surface and surface science, 6 films")).
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