In this day and age we expect tools to work similarly to our standard tools - Google, Word, etc. However, some tools work differently. Making sure that end users are familiar with specifications of Wrike will save a lot of time and hassle.
Specifically, the search function is different from most. Users have to write the word "AND" between two words they want to be present in the search result, and make sure it is CAPITALIZED. If they do not, the search results may not provide them with relevant results.
Many other idiosyncrasies can be found in the official documentation of the search engine:
Forcing all end users to review this and other essential entries in the Wrike KB is crucial to long term success.