Perhaps you should try some spelling variations:
"element modeling algorithm" » "element scheduling algorithm" (Expand Search), "elements modeling algorithm" (Expand Search)
"tested using algorithms" » "tested cosine algorithm" (Expand Search), "system using algorithms" (Expand Search)
"level coding algorithm" » "level cosine algorithm" (Expand Search), "level colony algorithm" (Expand Search), "level scheduling algorithm" (Expand Search)

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: (("tested using algorithms") OR ((("element modeling algorithm") OR ("level coding algorithm"))))~.
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• Removing quotes may allow a broader search: (( tested using algorithms ) OR ((( element modeling algorithm ) OR ( level coding algorithm )))).
• Adding a wildcard symbol may retrieve word variants: (("tested using algorithms") OR ((("element modeling algorithm") OR ("level coding algorithm"))))*.