Question:

Why does a document full-text search not return certain terms that contain hyphens?

Answer:

The document may be formatted with non-breaking hyphens.  These are different than hyphens that can be entered into the Search bar.

Example:  SOP-2001-Veeva-Knowledgebase-Regulations-US-Ohio

Copy the search term from the document and paste it into a text editor. Non-breaking hyphens do not copy over.

Related Documentation:

Vault Search Documentation: Full Text Searching 

Thank you