Work Log dialog has a searcher capability on issue field. Search can be done with selecting filter that are ‘All', ’Recent', 'Assigned', 'Reported', 'Watched', 'Internal', 'Filters' on the top and searching text in the issue field as describes in Issue Filters on Work Log Dialog.
After selecting filter and entering text, you will see the issues are divided into two groups 'History Search' and 'Current Search'. 'History Search' part is the same for the all filters because it shows all issues related to your searching text in issue field. 'Current Search' part shows the issues related to desired filter for current searches.
