Perhaps you should try some spelling variations:
"children's first and children's playgroups" » "children's first and children playground", "children's first and children's playhouses", "children's first and children's plays", "children's digest and children's playgroups", "children's art and children's playgroups", "children's films and children's playgroups"
"children's first and children's playmate" » "children's first and children's play", "children's first and children's plays", "children's first and children's playhouses", "children's digest and children's playmate", "children's art and children's playmate", "children's films and children's playmate"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("children's first and children's playgroups") or ("children's first and children's playmate"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("children's first and children's playgroups") OR ("children's first and children's playmate")).
• Removing quotes may allow a broader search: (( children's first and children's playgroups ) or ( children's first and children's playmate )).
• Adding a wildcard symbol may retrieve word variants: (("children's first and children's playgroups") or ("children's first and children's playmate"))*.