Perhaps you should try some spelling variations:
"modified allocation optimization algorithms" » "modified allocation optimisation algorithm", "modified allocation estimation algorithms", "modified allocation estimation algorithm", "modified location optimization algorithms"
"model using search algorithm" » "model using source algorithm", "model using egarch algorithm", "model nursing research algorithm", "model using servo algorithm", "code using search algorithm", "models nursing search algorithm", "powder using search algorithm"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("model using search algorithm") or ("modified allocation optimization algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("model using search algorithm") OR ("modified allocation optimization algorithms")).
• Removing quotes may allow a broader search: (( model using search algorithm ) or ( modified allocation optimization algorithms )).
• Adding a wildcard symbol may retrieve word variants: (("model using search algorithm") or ("modified allocation optimization algorithms"))*.