shrub or climber that flowers in shade

Is there a plant ideally a climber or a small shrub that will grow in shade and flower all year round or most of year, evergreen preferably.I have a small plot with a few shrubs and climbers but none really flower even though when i got them a couple of years ago they said they would in the garden centre.I am not entirely clueless when it comes to gardening, but i am learning.