Perhaps you should try some spelling variations:
"certification / valuation / africa, west / early works to 1800" » "certification / evaluation / africa, west / early works to 1800", "certification / valuation / africa, test / early works to 1800"
"identification / valuation / africa, west / early works to 1800" » "identification / evaluation / africa, west / early works to 1800", "identification / valuation / africa, test / early works to 1800"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"certification / valuation / africa, west / early works to 1800\") OR (\"identification / valuation / africa, west / early works to 1800\"))".
• Removing quotes may allow a broader search: (( certification / valuation / africa, west / early works to 1800 ) OR ( identification / valuation / africa, west / early works to 1800 )).
• Adding a wildcard symbol may retrieve word variants: (("certification / valuation / africa, west / early works to 1800") OR ("identification / valuation / africa, west / early works to 1800"))*.