MRS uses an implicit AND for multiple search terms. To create more complex queries you can enter boolean operators. The operators supported are AND (&), OR (|) and NOT (!). You can also combine terms using parenthesis. Please note that the operator names should be in upper case.
Parenthesis are also supported, i.e. you can now group boolean expressions together in more complex expressions.
'lysosyme OR lysozyme'
'lysozyme AND NOT kw:est'
'(lysosyme OR lysozyme) AND NOT kw:est'