To find the public health specialist's record you want, you do not need to enter information in all sections.
A specialist's UKVR registration number is a unique identifier and will give an exact match even without a name. e.g. 1234567.
Only use the surname or forename sections if you do not have the UKVR registration number.
You can apply a 'wild card' search by part of the name, i.e. 'Te' for 'Tess', 'Tessa', 'Tessie' etc.