Perhaps you should try some spelling variations:
optimisation algorithm » optimization algorithms, estimation algorithm, estimation algorithms
df optimisation » _ optimisation, _ optimization, qoe optimization
morse algorithm » source algorithm, mom algorithm
using morse » using force
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: (( (code OR core) using morse algorithm ) or ( modified df optimisation algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( (code OR core) using morse algorithm ) OR ( modified df optimisation algorithm )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( (code OR core) using morse algorithm ) or ( modified df optimisation algorithm ))".
• Adding a wildcard symbol may retrieve word variants: (( (code OR core) using morse algorithm ) or ( modified df optimisation algorithm ))*.