HELPER
SEARCH TIPS

  Boolean logic defines logical relationships between terms in a search. Boolean search supports AND, OR, NOT operator expressions. You can use these operators to create a very broad or very narrow search.

  • AND combines search terms so that each search result includes all terms. For example, Turkish AND librarianship finds articles that include both Turkish and librarianship. see

  • OR combines search terms so that each search result contains at least one of the terms. For example, islam OR ihsan finds results that contain islam or ihsan. see

  • NOTE excludes terms so that not every search result contains any of the related terms. For example, law NOT sea finds results that contain law but not sea. see

Note: When performing a scan, the AND operator takes precedence over the OR operator.



AND OR NOT
Each result contains all search terms. Each result contains at least one search term. Results do not include the specified terms .
Heart AND lung finds items that contain both a heart and lungs. see Heart The OR lung search finds items that contain a heart or lung. see Heart The NOTE lung search finds items that contain a heart but not a lung. see

  1. Boolean Operators and Using Parentheses

    2. For even better use of Boolean operators, parentheses.
    (lung OR liver) AND cancer will scan results that contain the word lung or liver and the word cancer. see

    If there are nested parentheses, the search engine will return the expression in the innermost parentheses first, then the next one, and so on. scans until the entire query is interpreted.
    (((lung OR liver) AND (cancer OR embolism)) see
    ((lung OR liver) AND cancer) OR diseases see

  1. Using *(asterisk) Search

    2. Boolean operators are the * (asterisk) added to the beginning, end, or middle of a word. ) completes the word with possible words.
    acute myeloid leukemia and chil* treatment see
    acute myeloid leukemia and chil* treat* see

  1. Using Quotation Search

    2. Boolean operators when contained within a quoted phrase, any Searches the entire search phrase instead of the word.
    "General Characteristics of Our Patients Hospitalized with Lung Cancer Diagnosis" see

  1. Boolean Operators and Using Quotes

    2. You can use quotes to search for a phrase with
    Boolean operators .
    ("Lung Cancer") AND ("Radiation Pneumonia") scans data where the phrases Lung Cancer and Radiation Pneumonia occur simultaneously. See
    ("Lung Cancer") OR ("Radiation Pneumonia") scans data for the phrase Lung Cancer or Radiation Pneumonia. See