Perhaps you should try some spelling variations:
"strength of materialles" » "strengthen of materialles", "strength of materiales", "strength of materializes", "strength of materials", "strength of materiallles"
"strengths of materialles" » "strengthens of materialles", "strengths of materiales", "strengths of materializes", "strengths of materials", "strengthen of materialles", "strengths of materiallles"
"strengthens of materia" » "strengthenens of materia", "strengthen of materia", "strengthened of materia", "strengthening of materia", "strengthens of material"

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("strength of materialles") OR ("strengths of materialles"))) OR ("strengthens of materia"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"strength of materialles\") OR (\"strengths of materialles\"))) OR (\"strengthens of materia\"))".
• Removing quotes may allow a broader search: (((( strength of materialles ) OR ( strengths of materialles ))) OR ( strengthens of materia )).
• Adding a wildcard symbol may retrieve word variants: (((("strength of materialles") OR ("strengths of materialles"))) OR ("strengthens of materia"))*.