Perhaps you should try some spelling variations:
"international comparison of agricultural and biosystems engineering" » "international comparison of agricultural and systems engineering", "international comparison of agricultural and esystems engineering", "international comparison of agricultural and ecosystem engineering"
"international cooperation of agricultural and biosystems engineering" » "international cooperation of agricultural and systems engineering", "international cooperation of agricultural and esystems engineering", "international cooperation of agricultural and ecosystem engineering"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"international comparison of agricultural and biosystems engineering\") OR (\"international cooperation of agricultural and biosystems engineering\"))".
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• Adding a wildcard symbol may retrieve word variants: (("international comparison of agricultural and biosystems engineering") OR ("international cooperation of agricultural and biosystems engineering"))*.