Filter Dynamic Content Items by one or multiple categories

Utilities.cs

/// <summary>
/// Get an IQueryable result of Dynamic Content Items filtered by multiple categories
/// </summary>
/// <param name="categoryIds"></param>
/// <param name="dynamicType"></param>
/// <returns></returns>
private IQueryable<DynamicContent> GetItemsByCategories(Guid[] categoryIds, Type dynamicType) {

    // Get the DynamicModule manager
    var dynamicModuleManager = DynamicModuleManager.GetManager();

    // Get an IQueryable result of dynamic content items filtered by multiple categories
    var dynamicContentItems = dynamicModuleManager.GetDataItems(dynamicType).Where(
        x => x.GetValue<TrackedList<Guid>>("Category").Any(t => categoryIds.Contains(t)) &&
        x.Status == Telerik.Sitefinity.GenericContent.Model.ContentLifecycleStatus.Live);

    return dynamicContentItems;
}

/// <summary>
/// Get an IQueryable result of Dynamic Content Items filtered by one category
/// </summary>
/// <param name="categoryIds"></param>
/// <param name="dynamicType"></param>
/// <returns></returns>
private IQueryable<DynamicContent> GetItemsByCategory(Guid categoryId, Type dynamicType) {

    // Get the DynamicModule manager
    var dynamicModuleManager = DynamicModuleManager.GetManager();

    // Get an IQueryable result of dynamic content items filtered by one category
    var dynamicContentItems = dynamicModuleManager.GetDataItems(dynamicType).Where(
        x => x.GetValue<TrackedList<Guid>>("Category").Contains(categoryId) &&
        x.Status == Telerik.Sitefinity.GenericContent.Model.ContentLifecycleStatus.Live);

    return dynamicContentItems;
}

Hi, I am using some custom hierarchical list classifications to filter my events but in front-end, Sitefinity is only allowing me to use one classification at a time to filter the events. How can I use your code to enable multiple classification selection before filtering the events? Thanks.