Perhaps you should try some spelling variations:
compared boron » coated boron (Expand Search), combined boron (Expand Search), colored boron (Expand Search)
nail compared » nails compared (Expand Search), nacl compared (Expand Search), naive compared (Expand Search)
boron ngoc » horn ngoc (Expand Search)
nayl clamp » tail clamp (Expand Search)
class can » class care (Expand Search), class c (Expand Search)
can ngoc » van ngoc (Expand Search), cao ngoc (Expand Search), tran ngoc (Expand Search)
clamp a » clamp _ (Expand Search), clamp j (Expand Search)
3 nail » _ nail (Expand Search), a nail (Expand Search), 3 nacl (Expand Search)
a nayl » a nacl (Expand Search)
a now » a non (Expand Search), _ now (Expand Search), a nos (Expand Search)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

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: (( 3 nail compared boron ngoc ) OR ((( a nayl clamp a now ) OR ( a new class can ngoc ))))~.
• Adding a wildcard symbol may retrieve word variants: (( 3 nail compared boron ngoc ) or ((( a nayl clamp a now ) or ( a new class can ngoc ))))*.