Starting from version 3.15.1, you can enable multiline searching by calling:

PDFLayoutview.PDFFindStart(val, false, false, true);

By passing true to the last parameter, you will obtain the following behavior:

• Search ignoring space
  • If the document contains "of the", and the search query is "ft", it will match the text.
• Multiline search
  • When the text is wrapped into two lines, searching using space instead of newline character would match the text.