Search application in Connections seems to be case-sensitive. For example, a search for "Apple" returns results, while a search for "apple" results in zero hits.
When we configured English and German dictionary in search-config.xml with german as default. Browsers are typically configured for german language. Search is using the browser language settings to select the corresponding dictionary. If a search query string cannot be found in the dictionary, search will perform an "exact match" search between search term and content term.