The operators allow you to make targeted and precise searches You can use them for quick searches and for advanced searches as well.
Directly to the left of a word in a query, the '+' character will limit the search to documents that contain it. For example, +spontaneous pneumothorax retrieve all the documents about pneumothorax including the word spontaneous.
Directly to the left of a word in a query, the '-' character will limit the search to documents without that word. For example, - spontaneous pneumothorax, retrieve all the documents referring to pneumothorax, but not containing the word spontaneous.
" ... "
When two words in a query are placed between double quotes "...", they must be present together in all the results. This symbol allows the search for compound words or phrases. For example, the query "spontaneous pneumothorax" will retrieve all documents containing the term spontaneous pneumothorax. Please note, this search will retrieve grammatically correct results: for example, the term "Pathologies respiratory muscles" will return Pathologies of respiratory muscles.
[ ... ]
When several words of a query are placed between square brackets, they will appear in each result, within the same nominal group (noun + adjective +…).
< ... >
When several words of a query are placed between <... >, they will appear in each result, appearing within the same sentence.
Located directly on the right of a truncated word, the * will extend the search to all words starting with the same characters. For example, the search question* will likely retrieve the words question, questionnaire and questioning, along with plurals etc.