Perhaps you should try some spelling variations:
"union assembly" » "unit assembly", "junction assembly", "function assembly"
"units assembly" » "unit assembly", "its assembly", "kits assembly"
"non assembly" » "down assembly", "exon assembly", "fin assembly"

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: (("non assembly") OR ((("union assembly") OR ("units assembly")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"non assembly\") or (((\"union assembly\") OR (\"units assembly\"))))".
• Removing quotes may allow a broader search: (( non assembly ) or ((( union assembly ) OR ( units assembly )))).
• Adding a wildcard symbol may retrieve word variants: (("non assembly") or ((("union assembly") OR ("units assembly"))))*.