Google and Google Scholar

Results will differ on different computers depending on the search history. 

Word order matters. It changes the order your results will appear in. 

Google automatically searches:

• British spellings
• plurals and other word endings
• synonyms

 
Specify what to search

"vaccine"      (searches only that word, no plurals or synonyms}
"adult leukemia"      (searches words together in that order) 
"adult * leukemia"      {searches that phrase with one word in between: adult acute leukemia, adult onset leukemia}

"adult AROUND(2) leukemia"   {searches the phrase with 2 words inbetween:  adult acute myeloid leukemia, adult onset lymphoblastic leukemia}

Specify where to search

intitle:glioblastoma       {searches the titles of web pages.  Don't use spaces or capitals) 
inurl:.edu      {searches words in a URL. Don't use spaces or capitals}
leukemia site:mdanderson.org     {searches a particular website. Don't use spaces or capitals}
breast cancer site:UK     {use two letter country codes}
palliataive care filetype:PDF       {DOCX, XLS, TXT, XML, etc}
chemotherapy after:2020      {searches webpages created or updated after 2020}

AND: Not needed. Google automatically inserts AND between your search terms

OR:    lymphoma OR "lymphatic cancer"

NOT: leukemia -feline

Google ignores most punctuation marks so you can't combine: (a OR b) AND (c OR d)