Google Scholaris desirable when you have an article title to look for in hand, but not convenient when searching by keywords - too many irrelevant results.
OneSearchis a one-stop local and remote library resources search engine. You may find a lot of scholarly materials here. You can also find information that the library has already paid the subscription fee for you and which are not directly available through Google search.
Directly search in a Databaseif you have a concrete subject to research. A database can be a collection of journals, which each is a collection of articles. Some databases focus on a specific subject area, e.g. Hospitality and Tourism Complete covers articles on scholarly research and industry news relating to hospitality and tourism areas. Especially for statistics type of information, you will need to find from databases instead of OneSearch, find out more details here.
You can find journal articles via OneSearch, Google Scholar@PolyU and Databases. Here are the searching tips: