Yahooligans for example is a version of Yahoo for younger students. Some search engines find many more pornographic and inappropriate sites than others. Or add them to your Personal Bookmarks and they will appear in the top menu bar. Like a Meta Search Engine it can search many search engines at once. These Web search tips will help you get started with just about any search engine out there.
All search engines contain details on improving searching.
So review the specific search tips on each search engine. When searching for a proper name, capitalize the first letter of each word, otherwise use all lowercase. Use quotations marks when doing a phrase search. Use hyphens when searching for words that must appear within one word of each other. Most search engines have a special image section.