Select Find from the Time menu to display this window.

All time entries are searched starting from the first time entry.  Upper and lower case letters do not matter.  If the search text is found in a time entry, that time entry is selected and scrolled into view, and the Find button changes to Find Next.

 

To find the next time entry that contains the search text, click on Find Next.  If no more time entries are found that contain the search text, the Mac beeps, the search text is highlited, and the button reverts to Find.