Advanced search does not allow standard author abbreviations according to Brummitt and Powell, and IPNI
Use case: All records of the author Kützing, databased as Kütz.
Kütz gives all data back, Kütz. gives no result.
Same in Cichorieae portal
Boiss gives all data back, Boiss. gives no result.
This seem to be a general problems in the search functionality.