Perhaps you should try some spelling variations:
"modified ti6al4v optimisation algorithm" » "modified ti6al4v optimization algorithms", "modified ti6al4v estimation algorithm", "modified ti6al4v estimation algorithms"
"modified notion approximation algorithms" » "modified network approximation algorithms", "modified time approximation algorithms", "modified one approximation algorithms"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified ti6al4v optimisation algorithm") OR ("modified notion approximation algorithms"))~.
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