Keywords may be separated by AND and/or OR statements for greater control of the search results.
For example, Higher AND Computing finds papers that contain both words. Higher OR National finds papers that contain either word.
Exact matches can be searched for by enclosing keywords in double-quotes.
For example, "Computing Science" finds only that exact phrase.
Brackets can be used for further control on the result set.
For example, Computing AND (Higher OR "National 5").
