Hello, 14 Days Laos itinerary for verification please

Hey everybody,

i do a trip of 14 Days in Laos and I want to know if my itinerary is possible.

Day 1 Vientiane, Day 2-3 Vang vieng, Day 4-5 Luang Namtha, Day 6 Travel Luang Martha oudom xay and Nong Khiaw., Day 7 Nong Khiaw, Day 8-9 Muang Ngoni, Day 10-14 Luang Prabang

I want to know if it's possible to go in Luang Prabang and Nong khiaw ? Do you think 2day in vang vieng is too much ? thank you