Perhaps you should try some spelling variations:
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"international centre for mechanical science, courses and lectures" » "international theatre for mechanical science, courses and lectures", "international context for mechanical science, courses and lectures", "international case for mechanical science, courses and lectures", "international centre for mechanism science, courses and lectures", "international centre for mechanical stretch, courses and lectures", "international centre for mechanical impedance, courses and lectures", "international centre for mechanical science, courses and lecture"
"international centre for clinical science, courses and lectures" » "international theatre for clinical science, courses and lectures", "international context for clinical science, courses and lectures", "international case for clinical science, courses and lectures", "international centre for political science, courses and lectures", "international centre for clinical evidence, courses and lectures", "international centre for ecological science, courses and lectures", "international centre for clinical science, courses and lecture"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("international centre for mechanical science, courses and lectures") OR ("international centre for mechanical efficiency, courses and lectures"))) OR ("international centre for clinical science, courses and lectures")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"international centre for mechanical science, courses and lectures\") OR (\"international centre for mechanical efficiency, courses and lectures\"))) or (\"international centre for clinical science, courses and lectures\"))".
• Removing quotes may allow a broader search: (((( international centre for mechanical science, courses and lectures ) OR ( international centre for mechanical efficiency, courses and lectures ))) or ( international centre for clinical science, courses and lectures )).
• Adding a wildcard symbol may retrieve word variants: (((("international centre for mechanical science, courses and lectures") OR ("international centre for mechanical efficiency, courses and lectures"))) or ("international centre for clinical science, courses and lectures"))*.