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Operators + - & ()
There are three logical operators you can use, each has a default ID that can be changed to suit your needs.
The + plus character is used to tell the system to add together multiple searches for example perhaps you are happy with
several colours RED + BLUE + GREEN.
If you are looking for mobile homes you could add CARAVAN + CAMPERVAN and finally only those campervans and caravans in my colours.
(RED + BLUE + GREEN) & (CARAVAN* + CAMPERVAN*)
We used parenthesis to force this search first into two collections so we can then
logically and (the & ampersand) them together finding only those items we are interested in.
The remaining operator is the - minus sign, in this case we use it to remove items from the collection like this VEHICLE* - CAR*.
The search formula is executed from left to right and has no limits on complexity with parenthesis being nested as many
times as you need them, either for clarity or accuracy.
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