Perhaps you should try some spelling variations:
"oxford pictorial topography / oxford pictorial topography" » "oxford historical topography / oxford historical topography", "oxford editorial typography / oxford editorial typography", "oxford history topography / oxford history topography", "food pictorial topography / food pictorial topography", "world pictorial topography / world pictorial topography"
"oxford corneal topography / oxford corneal topography" » "oxford canal topography / oxford canal topography", "oxford formal topography / oxford formal topography"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"oxford pictorial topography / oxford pictorial topography\") OR (\"oxford corneal topography / oxford corneal topography\"))".
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