Perhaps you should try some spelling variations:
"vector retrieval conference" » "vector retrieval inference", "vector retinal conference", "vector retrieval preference", "trajectory retrieval conference"
"elgar original references" » "elgar origin references", "elgar origins references", "elgar marginal references", "einer original references"
"angr original references" » "angr origin references", "angr origins references", "angr marginal references", "age original references", "nor original references", "cancer original references"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("vector retrieval conference") OR ((("elgar original references") OR ("angr original references")))).
• Removing quotes may allow a broader search: (( vector retrieval conference ) or ((( elgar original references ) or ( angr original references )))).
• Adding a wildcard symbol may retrieve word variants: (("vector retrieval conference") or ((("elgar original references") or ("angr original references"))))*.