Perhaps you should try some spelling variations:
2020 france » 2010 france, 2021 france, 2023 france
20 france » 20 fringe
10 france » 10 finance, 10 frame
2f law » 20 law, 21 law, 22 law
28 law » 20 law, 21 law, 28 low

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: %industrial hygiene %((2f law) OR (28 law)) AND legislation %((((20 france) OR (2020 france))) OR (10 france))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%industrial hygiene %((2f law) or (28 law)) and legislation %((((20 france) OR (2020 france))) or (10 france))%22".
• Adding a wildcard symbol may retrieve word variants: %industrial hygiene %((2f law) or (28 law)) and legislation %((((20 france) OR (2020 france))) or (10 france))%22*.