Perhaps you should try some spelling variations:
optimization algorithm » optimization algorithms, optimisation algorithm, estimation algorithm
evolutionary algorithm » evolution algorithm, solution algorithm
early evolutionary » early evolution
df optimization » _ optimization, qoe optimization, _ optimisation
modified early » modified male, modified near
modified df » modified _, modified adam, modified bi1

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( modified early evolutionary algorithm ) OR ( modified df optimization algorithm ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( modified early evolutionary algorithm ) OR ( modified df optimization algorithm ))".
• Adding a wildcard symbol may retrieve word variants: (( modified early evolutionary algorithm ) OR ( modified df optimization algorithm ))*.