You can use the searchbox for a quick and dirty search.
You can search for:
Formulate your search as short and clear as possible and without a question mark. For a quick search it is not necessary to add Boolean operators (such as AND or OR). A more extensive search? Use the Advanced Search Builder.
Results are automatically sorted on 'Best Match'. The newest articles at the top? Sort on Publication date or Most recent (that is when a record is added to PubMed).
For more tips and tricks for a quick search in PubMed: