RadGrid filter command is not triggered for strings containing "and" word. Video: https://www.screencast.com/t/j649UvPQ3z6 Steps to reproduce: Filter by "SUNBAY AND LEONA A" in the following demo: https://demos.telerik.com/aspnet-ajax/grid/examples/functionality/filtering/excel-like-filtering/defaultcs.aspx
This is a security feature. Some words that have meaning in SQL queries are not allowed in filtering expressions. You can change this behavior at your own risk by following this KB article: https://www.telerik.com/support/kb/aspnet-ajax/grid/details/filter-grid-with-quotes-and-or-or-other-special-symbols