Perhaps you should try some spelling variations:
"modified network optimization algorithm" » "modified network optimization algorithms", "modified network optimisation algorithm", "modified network estimation algorithm", "certified network optimization algorithm", "defined network optimization algorithm", "modified near optimization algorithm"
"modified objective allocation algorithmss" » "modified objective location algorithmss"

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: (("modified objective allocation algorithmss") or ("modified network optimization algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified objective allocation algorithmss") OR ("modified network optimization algorithm")).
• Removing quotes may allow a broader search: (( modified objective allocation algorithmss ) or ( modified network optimization algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified objective allocation algorithmss") or ("modified network optimization algorithm"))*.