As specific as possible. If you are too vague with your search you may end up with a very large result making it difficult to find what you want or your search criteria may not sufficiently match what you are looking for and miss your results.

Generally no. Ministries only issue refunds if there is a system failure on their end. It is important to ensure the data you enter is correct as the ministries will not re-process a request at a discounted rate or refund a request due to user error. Transactions go into a processing queue and while some provinces take longer than others to get responses back your request is sent to the ministies as soon as possible. Once a ministry has the transaction in their queue they will not abort the request.