Perhaps you should try some spelling variations:
optimisation algorithm » optimization algorithms, estimation algorithm, estimation algorithms
parameter optimisation » parameter optimization, parameter estimation
method algorithm » mom algorithm
using lc » using c, using low, using eco
using l » using a, using _, using 3

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( ((using l) OR (using lc)) method algorithm ) or ( modified parameter optimisation algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((using l) OR (using lc)) method algorithm ) OR ( modified parameter optimisation algorithm )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((using l) OR (using lc)) method algorithm ) or ( modified parameter optimisation algorithm ))".
• Adding a wildcard symbol may retrieve word variants: (( ((using l) OR (using lc)) method algorithm ) or ( modified parameter optimisation algorithm ))*.