Perhaps you should try some spelling variations:
nijhoff international » off international, nations international, banff international
rivf international » ccf international, private international, auf internationale
flow series » flow serves, flow stories, flow serial
law series » law stories, new series, law serial

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: ((nijhoff international) OR (rivf international)) trade ((law series) OR (flow series)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((nijhoff international) or (rivf international)) trade ((law series) OR (flow series))".
• Adding a wildcard symbol may retrieve word variants: ((nijhoff international) or (rivf international)) trade ((law series) OR (flow series))*.