Perhaps you should try some spelling variations:
"oxford historical hydrographs / oxford historical hydrographs" » "oxford historical hydrographic / oxford historical hydrographic", "oxford historical monographs / oxford historical monographs", "oxford historical geography / oxford historical geography", "oxford pictorial hydrographs / oxford pictorial hydrographs", "foreword historical hydrographs / foreword historical hydrographs", "informed historical hydrographs / informed historical hydrographs"
"oxford historical ethnography / oxford historical ethnography" » "oxford historical geography / oxford historical geography", "oxford historical demography / oxford historical demography", "oxford historical cartography / oxford historical cartography", "oxford pictorial ethnography / oxford pictorial ethnography", "foreword historical ethnography / foreword historical ethnography", "informed historical ethnography / informed historical ethnography"
"oxford historical photographs / oxford historical photographs" » "oxford historical cartography / oxford historical cartography", "oxford historical biogeography / oxford historical biogeography", "oxford historical geography / oxford historical geography", "oxford pictorial photographs / oxford pictorial photographs", "foreword historical photographs / foreword historical photographs", "informed historical photographs / informed historical photographs"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("oxford historical hydrographs / oxford historical hydrographs") OR ("oxford historical ethnography / oxford historical ethnography"))) OR ("oxford historical photographs / oxford historical photographs")).
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• Adding a wildcard symbol may retrieve word variants: (((("oxford historical hydrographs / oxford historical hydrographs") or ("oxford historical ethnography / oxford historical ethnography"))) or ("oxford historical photographs / oxford historical photographs"))*.