Below are some general guidelines and some useful search techniques. Finding search words that work can be hard. Ask librarians for help any time.
Try search words or phrases which describe a broad topic.
Try searching for narrow topics.
Search engine results may retrieve all types of resources (books, articles, etc.).
Try both search term approaches: searching for broad topics and narrow topics.
Enclose a phrase in quotation marks:
Combine multiple searches together with the word AND in capital letters:
Here are example searches which correspond to your portfolio topics: