Perhaps you should try some spelling variations:
jacobus henricus » jacobus hendricus, jacobus merrick
jacob henriques » joao henriques
jacobus fenwick » jacobus merrick
hoff" » off", hopf"

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: "((((jacobus henricus) OR (jacob henriques))) OR (jacobus fenwick)) van 't (hoff" or hof").
• The words AND, OR and NOT may confuse the search; try adding quotes: "\"((((jacobus henricus) OR (jacob henriques))) or (jacobus fenwick)) van 't (hoff\" or hof\")".
• Removing quotes may allow a broader search: ((((jacobus henricus) OR (jacob henriques))) or (jacobus fenwick)) van 't (hoff or hof ).
• Adding a wildcard symbol may retrieve word variants: "((((jacobus henricus) OR (jacob henriques))) or (jacobus fenwick)) van 't (hoff" or hof")*.