1. Use AND to search for words contained in a case but which do not necessarily
need to be together, e.g. Parent AND child.
2. Use OR when you want either one or the other word to be in the case, e.g. Parent OR
3. Use no connector when you want the words to appear together in a
case, e.g. Parent child ( to find "Parent child" relationship
4. For detailed OSCN search help,