Mongo db vector search query multiple topics simultaneously

I intend to query multiple vector collections simultaneously using the following approach:

vectorStore = MongoDBAtlasVectorSearch(
collection, embeddings, index_name=index_name
)
docs = vectorStore.similarity_search(query, K=10)
`
Is there a function or method available to query multiple vector collections at the same time and combine the results effectively? Any suggestions or examples would be greatly appreciated.