Perhaps you should try some spelling variations:
"strength of materias" » "strengths of materias", "strength of materia", "strength of materiales", "strength of bacterias"
"strengthen of materias" » "strengthsen of materias", "strengthen of materia", "strengthen of materiales", "strengthen of bacterias", "strengthening of materias"
"strengthen of material" » "strengthsen of material", "strengthening of material"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("strength of materias") OR ((("strengthen of materias") OR ("strengthen of material"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"strength of materias\") OR (((\"strengthen of materias\") OR (\"strengthen of material\"))))*".
• Removing quotes may allow a broader search: (( strength of materias ) OR ((( strengthen of materias ) OR ( strengthen of material ))))*.