Perhaps you should try some spelling variations:
"international context for mechanical science, courses and lectures" » "international congress for mechanical science, courses and lectures", "international conference for mechanical science, courses and lectures", "international context for mechanism science, courses and lectures", "international context for mechanical stretch, courses and lectures", "international context for mechanical efficiency, courses and lectures"
"international theatre for clinical science, courses and lectures" » "international treaties for clinical science, courses and lectures", "international trade for clinical science, courses and lectures", "international test for clinical science, courses and lectures", "international theatre for political science, courses and lectures", "international theatre for clinical evidence, courses and lectures", "international theatre for ecological science, courses and lectures"
"international centre for clinical science, courses and lectures" » "international case for clinical science, courses and lectures", "international capital for clinical science, courses and lectures", "international convention 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" » "international case for clinical science, courses and lecture", "international capital for clinical science, courses and lecture", "international convention for clinical science, courses and lecture", "international centre for political science, courses and lecture", "international centre for clinical evidence, courses and lecture", "international centre for ecological science, courses and lecture"

Try widening your search to All Fields.

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