Perhaps you should try some spelling variations:
\"selection–positron » \"detection–positron (Expand Search), \"selection–positions (Expand Search)
collider\" » consider\" (Expand Search)
\"electron–positives » \"electron–positive (Expand Search), \"electron–positively (Expand Search), \"electron–positions (Expand Search)
\"electron–position » \"electron–positive (Expand Search)

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: "\"((\\"selection–positron collider\\") OR ((\\"electron–positives OR \\"electron–position) collider\\"))\"".
• Removing quotes may allow a broader search: (( selection–positron collider ) OR (( electron–positives OR electron–position) collider )).