Link for Aglaia odorata. https://www.google.com/search?q=agalai+chinese+rice+flower+plant&sa=X&tbm=isch&tbo=u&source=univ&ved=0ahUKEwjdouqBkMjSAhUQwGMKHUTVAAYQ7AkIOA&biw=1525&bih=687#imgrc=pKzstCMVzDOmPM:

Link for Operculicarya decaryi. http://www.botanicwonders.com/Feature-Operculicarya-decaryi.html

There are few Bonsai with leaves that look similar to yours. I’m not an expert and could only speculating from your photo. Keep in mind there are mislabeling on the Internet from various websites. Check out these plants and see if you have a match. -First one is the Chinese pepper tree with an unresolved scientific name Zanthoxylum beecheyanum K.Koch syn. Fagara alata var. beecheyana (K.Koch) M.Hiroe. -The second is Operculacarya decaryi. -The last one is Chinese Perfume Plant (Aglaia odorata). I’m leaning toward the Zanthoxylum genus . You will know for certain when it blooms. Link below with helpful ways to distinguish between the Z. beecheyanum & the Operculacarya. Best wishes! http://ibonsaiclub.forumotion.com/t349p15-new-bonsai