The following sites are to be used only to find keywords and phrases that you can then use as search terms when searching for articles and books.
health care (noun): a set of actions by a person or persons to maintain or improve the health of a patient/consumer
healthcare (noun or adjective): a system, industry, or field that facilitates the logistics and delivery of health care for patients/consumers
Use quotation marks around phrases and an asterisk * to truncate a word (except in PubMed):
mortality AND "cardiovascular disease"
"life expectancy" AND male* (the * will search for male or males)
"life expenctancy" AND female*
percentage AND "normal body mass"
"health care delivery system*"
GDP AND ("health care expenditure*" OR "health care cost*")
healthcare AND (benefit* OR limitation*)
Although the article may talk about these but never mention the words "benefit" or "limitations", think of some terms that may be a "benefit" or a "limitation". e.g., Germany AND "health care insurance" AND "United States"
You may have to search separately and then compare two articles, e.g. search "United States" AND "infant mortality" then search for Germany AND "infant morality" and compare.
Write out "United States" (do not use US or U.S.)
Limit your search by date range.