Translating your search strategy is important as each database has differences in syntax, subject headings, and search interfaces.
Web of Science
#1 TS=((Boreal NEAR/5 (forest* OR zone OR tree*)) OR taiga OR spruce* OR picea OR pine* OR pinus OR birch* OR aspen* OR populus) #2 TS=(Finland OR Finnish OR Swed* OR Norw* OR Russia* OR Estonia* OR Latvia* OR Lithuania* OR Fennoscan* OR Scandin* OR Baltic OR “North* Europ*” OR Canad* OR “North* Ameri*” OR Siber* OR Alaska OR “United States” OR USA) and TS=(forest* OR tree*) #3=#1 OR #2 #4 TS=(“key habitat*”) OR TS=(“forest act habitat*”) OR TS=(reserve* NEAR/5 (forest* OR privat* OR area* OR patch* OR habitat*)) OR TS=(“private* protected area*”) OR TS=(voluntar* NEAR/5 (conservation* OR set-aside*)) OR TS=(METSO NEAR/5 program*) OR TS=(Komet NEAR/5 program*) OR TS=(conservation NEAR/5 easement*) OR TS=(connectiv*) #5=#3 AND #4
Google Scholar
Boreal AND ("key habitat" OR "voluntary conservation" OR "voluntary set-aside" OR "private protected area" OR "private reserve") AND (biodiversity OR “species richness” OR “species diversity” OR abundance)
Example search strings used in Häkkilä, M., Johansson, A., Sandgren, T., Uusitalo, A., Mönkkönen, M., Puttonen, P., & Savilaakso, S. (2021). Are small protected habitat patches within boreal production forests effective in conserving species richness, abundance and community composition? A systematic review. Environmental Evidence, 10, 1-20. https://doi.org/10.1186/s13750-020-00216-6