I want to know the answer to the following question:
What event resulted in the triumph of Serbia over Bulgaria in 1330?
All the background I'm provided with is that "Yet Serbian dominance was short-lived; the Serbian army led by the Lazar Hrebljevanovic was defeated by the Ottomans at the Battle of Kosovo in 1389, where most of the Serbian nobility was killed and the south of the country came under Ottoman occupation, as much of southern Bulgaria had become Ottoman territory in 1371.". Is that enough to answer the question?
Answer: no