The command line search mode is the most powerful way to find documents. Combining the use of boolean and proximity operators, with limits and filters will help dig into results, offering more relevant documents. You can build complex queries such as this one:
"virus" "ebola" AND keywords:("epidemic") AND year:(<2015)
Command line can be used from the main (basic) search page, but if you are not familiar with the syntax, you can start from the advanced search page; from there you will be able to start building your query. Using this query builder will help users quickly learn what search options are available.
|Boolean:||AND, OR, -|
|fields:||title, abstract authors, journal, keywords, year|
Please consult our search operators section for more details on operators and syntax