At last count, this was nearly 5,000 entries. Some individuals that work at UMKC but are 'without compensation'. These do not necessarily appear in the HR data. Another possible reason you can't find someone is that you are narrowing your search too much. Unfortunately, first names present a major difficulty.
Some people go by their middle name instead of their first name.
Some people go by a preferred name but do not include the preferred name when they update their personnel information. To further complicate matters, even if you choose the right first name, you still may not get someone because they might not work in the department you think they work in. Middle and preferred name matches are high-lighted in grey. The next most general search would be to enter the first two characters of the last name. When in doubt, provide the least amount of information possible.