Customer would like to have additional search options for the Resume or Cover Letter criteria in Candidate Search:
"Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental."
SAP SuccessFactors Recruiting Management
Currently this is an expected behavior and there is no way to add another search option for Resume or Cover Letter in Candidate Search.
If you wish to have this feature added in future released you may need to raise an enhancement request to be reviewed by our Product Management.
For steps on how to submit an enhancement, please follow the steps provided in KBA 2090228 - How to Submit Ideas for SAP SuccessFactors Products
Candidate Search, Criteria, Search Options , KBA , LOD-SF-RCM-CAN , General Candidate Issues (not Offers, not Profiles) , How To