For complex searches with several combinations, you
can use a special search feature.
search mask, you find a search command line „Expert search“. This line can be
filled with search terms, identified by abbreviations of the respective search
aspects and the operators for combination.
abbreviations and further information are explained in the corresponding help
below means: search for the subject heading (SUB) „Thomas Aquinas“, connected
(„and“) with the broader subject (classification: KLA) sacrament (nbp) or
(„or“) soteriology (nbk), further („and“) with the language („LAN=“) of the
searching with the search mask, the expert search has some advantages: you can
combine more than four search aspects or while searching for sources you can
also work with the aspects publisher (PUB), country of publication (CTR), place
of publication (PLA).