In search, most Internet users use bald Latin alphabet (without letters č, ć, š, ž and đ). This is similar to how in German language the search for "Muenchen" will return the results for "München". Thus, Serbian Wikipedia should support searching in this way, but it doesn't. Example:

1. Search for "marković": https://sr.wikipedia.org/w/index.php?title=%D0%9F%D0%BE%D1%81%D0%B5%D0%B1%D0%BD%D0%BE:%D0%9F%D1%80%D0%B5%D1%82%D1%80%D0%B0%D0%B6%D0%B8&profile=default&fulltext=Search&search=markovi%C4%87&searchToken=cibdktt9t7eu2hv4o3n1hgg84
   1. Observed: 207 search results.
2. Search for "markovic": https://sr.wikipedia.org/w/index.php?title=%D0%9F%D0%BE%D1%81%D0%B5%D0%B1%D0%BD%D0%BE:%D0%9F%D1%80%D0%B5%D1%82%D1%80%D0%B0%D0%B6%D0%B8&profile=default&fulltext=Search&search=markovic&searchToken=gf3dawrz4tio3a91fujm144m
   1. Expected: all the 207 previous search results should appear.
   2. Observed: Only 47 results appear.

An overview of the issue is given at https://wiki.apache.org/solr/SerbianLanguageSupport