Perhaps you should try some spelling variations:
"sequence networks. historical survey" » "frequency networks. historical survey", "sequential networks. historical survey", "influence networks. historical survey"
"services network. historical survey" » "service network. historical survey", "service networks. historical survey"

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: (("services network. historical survey") OR ("sequence networks. historical survey"))*.
• Removing quotes may allow a broader search: (( services network. historical survey ) or ( sequence networks. historical survey ))*.