In a 6-qt. stockpot, heat oil over medium-high heat; saute celery and onions until tender, 3-5 minutes. Stir in sweet potatoes, garlic, seasonings, coconut milk and broth; bring to a boil. Reduce heat; simmer, uncovered, just until potatoes are tender, 15-20 minutes, stirring occasionally., Stir in green beans and garbanzo beans; cook, uncovered, until green beans are tender, about 5 minutes, stirring occasionally. Serve with rice.