jahia search field

Hello, I want to search on folder name.
Here is the container definiton:
 
content:declareContainerList name='directoryProjectContainer'
title="Project container">
    <content:declareContainer>
        <content:declareField name='directoryProjectName'
            title="Folder name"
            titleKey="folderName"
            bundleKey="<%=resBundleID%>"
            type="SmallText"
        />
        <content:declareField name='directoryProjectDescription'
            title="Description"
            titleKey="description"
            bundleKey="<%=resBundleID%>"
            type="SmallText"
        />
        <content:declareField name='directoryProjectPage'
            title="Folder page"
            titleKey="folderPage"
            bundleKey="<%=resBundleID%>"
            type="Page"
            value="<jahia_linkonly>"
        />
    </content:declareContainer>
</content:declareContainerList>

I tried: (FIELD_FIELDNAME:'directoryProjectName') AND (FIELD_VALUE:*)
 
but It doens' t work
 
can you help me?