Do not forget that you can use logical operators such as 'and' 'or' 'not' in the search field ('and' is assumed if no operator is specified). I am not sure if there is an "exact match" syntax so that you can stop 'fiction' also matching 'non-fiction'? With your example you could say
Code:
tag:fiction and not tag:non-fiction
Note I used tag: as the prefix to stop the search looking in any other fields. This technique can also be used for other fields such as author: or format: . As the most recent searches are available in the drop-down box it is quick to get back to any recently used ones without having to retype them.