Perhaps you should try some spelling variations:
"modified coverage approximation algorithms" » "modified average approximation algorithms"
"modified thermal estimation algorithms" » "modified thermal estimation algorithm", "modified thermal optimization algorithms", "modified thermal optimisation algorithm", "modified thermal activation algorithms", "modified thermal oxidation algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified coverage approximation algorithms\") OR (\"modified thermal estimation algorithms\"))~".
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