Perhaps you should try some spelling variations:
optimisation algorithm » optimization algorithms, estimation algorithm, estimation algorithms
bi1 optimisation » _ optimisation, _ optimization, qoe optimization
source algorithm » our algorithm, search algorithm
using source » using force, using morse
modified bi1 » modified _

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 source algorithm ) or ( modified bi1 optimisation algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( (code OR core) using source algorithm ) OR ( modified bi1 optimisation algorithm )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( (code OR core) using source algorithm ) or ( modified bi1 optimisation algorithm ))".
• Adding a wildcard symbol may retrieve word variants: (( (code OR core) using source algorithm ) or ( modified bi1 optimisation algorithm ))*.