Perhaps you should try some spelling variations:
optimisation algorithm » optimization algorithms, estimation algorithm, estimation algorithms
modified learning » mobile learning, modified caging
df optimisation » _ optimisation, _ optimization, qoe optimization
from algorithm » mom algorithm, adam algorithm
modified df » modified _, modified adam, modified bi1

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• Performing a fuzzy search may retrieve terms with similar spellings: (( modified learning from algorithm ) or ( modified df optimisation algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( modified learning from algorithm ) OR ( modified df optimisation algorithm )).
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