Try to be less specific in your query. Try synonyms and variations on words. Try another search engine. Identify common words that are important to your search. Try to think of words that uniquely identify what you're looking for.
Some words are of little value, because they identify lots of documents.
The more distinctive a word, the more useful it will be for sharpening your search. No answer, Timed out, Too busy These are the most common types of problems you will get. The server you are trying to access may be too busy or temporarily down. Try at a less busy time of the day. Knowledge of world geography and time zones comes in handy when jumping to other sites elsewhere in the world.