You can do the following modification to the skill criteria for resource searching:
Click Add Skill to add more skills.
Click the icon to remove a skill.
Modify the Ideal Proficiency field for the skill.
The values available for this field is configured by the RSC – Skill Proficiency validation. This validation defines the sequence of proficiency levels. The system measures the proficiency level according to the sequence number. A high sequence number indicates a high proficiency level.