Perhaps you should try some spelling variations:
"positive minerals theorems" » "positive general theorems", "positive integral theorems", "negative minerals theorems", "positive mineral theories", "positive integrals theoreme"
"positive mental theorems" » "positive central theorems", "positive montel theorems", "positive general theorems"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"positive minerals theorems\") OR (\"positive mental theorems\"))".
• Removing quotes may allow a broader search: (( positive minerals theorems ) OR ( positive mental theorems )).
• Adding a wildcard symbol may retrieve word variants: (("positive minerals theorems") OR ("positive mental theorems"))*.