If you want the reference of papers on disability-free life expectancy in France authored by Robine, the search is:
France AND Disability-free life expectancy AND Robine
If you want the reference of papers on disability-free life expectancy in France or in Belgium, the search is:
France OR Belgium AND Disability-free life expectancy
Note the second operator used, AND, acts on all of the first expression, France OR Belgium.
If you want the references of papers on disability-free life expectancy and active life expectancy but not using the Sullivan method, the search is:
Disability-free life expectancy AND Active life expectancy NOT Sullivan method