Perhaps you should try some spelling variations:
"post modeling algorithm" » "post scheduling algorithm" (Expand Search), "most modeling algorithm" (Expand Search), "cost modeling algorithm" (Expand Search)
"element method algorithms" » "elements method algorithms" (Expand Search), "element methods algorithms" (Expand Search)
"element tree algorithms" » "elements tree algorithms" (Expand Search), "element three algorithms" (Expand Search), "element free algorithms" (Expand Search)

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("element method algorithms") OR ("element tree algorithms"))) OR ("post modeling algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"element method algorithms\") OR (\"element tree algorithms\"))) OR (\"post modeling algorithm\"))".
• Removing quotes may allow a broader search: (((( element method algorithms ) OR ( element tree algorithms ))) OR ( post modeling algorithm )).
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