There's never only ONE correct way to do it. If it works, it's right. If one search engine is slow to respond, try another. Be flexible, creative with your searches. Consider other forms of or alternate terms to describe your search.
Every search engine can have special features which distinguishes it from others.
Your search may be more successful in a particular engine. Search engines are constantly changing and evolving, and new ones keep appearing. Read the Help files periodically, to keep abreast of possible refinements. Search tools are being improved and new ones appear regularly. If you are using the same methods you used 3 months ago, you aren't looking around enough.