In most web browsers, you can zoom in and out by holding down the Ctrl key (the Cmd key in OS X) and pressing either the "+" or "-" key at the same time.
Another option is to use the mouse: hold down the Ctrl key and move the mouse scroll wheel. To return to normal size, press the Ctrl and 0 keys at the same time.
When searching by the Author, Title, etc the button Modify Search enables to limit your search by words on the Title, Author or Search Term field, by the publication year, language, type of publication (e.g book, newspaper, sheet music), location or publisher. The results can be sorted by the publication year.