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

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