I am carrying out a meta analysis for my PhD using Google Scholar as well as Scopus and Web of Science. I am wanting to find all papers which document the presence of alien or invasive or non-indigenous or non-native or introduced species in kelp forests or kelp beds, excluding all aquaculture or mariculture papers, as well as papers that use the term "teacher" in order to exclude papers pertaining to My Octopus Teacher.
These are my search terms:
(("alien species" OR "invasive species" OR "non-native species" OR "non-indigenous species" OR "introduced species") AND ("kelp forest*" OR "kelp bed*") AND (-"aquaculture" OR -"mariculture" OR -"teacher"))
These terms have worked fine is Scopus and WoS, however Google Scholar seems to be having difficulty with the section: AND (-"aquaculture" OR -"mariculture" OR -"teacher")). This section works if I replace the OR with AND but my concern is that if I do that then I am only excluding papers that include all three of those terms rather than either of those terms.
Is there a way to rephrase that section or am I not using the boolean operators correctly in Google Scholar?