Perhaps you should try some spelling variations:
tail complex » oil complex (Expand Search), atrial complex (Expand Search), basal complex (Expand Search)
complex can » complex case (Expand Search), complex care (Expand Search), complex cancer (Expand Search)
dna clamp » a clamp (Expand Search)
can ngoc » van ngoc (Expand Search), cao ngoc (Expand Search), tran ngoc (Expand Search)
nacl co » nacl co2 (Expand Search), nacl kcl (Expand Search), nacl kno (Expand Search)
clamp j » clamp _ (Expand Search)
3 tail » h3 tail (Expand Search), _ tail (Expand Search), a tail (Expand Search)
3 nacl » _ nacl (Expand Search), 3.5 nacl (Expand Search)
co can » co canal (Expand Search), co chain (Expand Search)
j neta » j netta (Expand Search), a neta (Expand Search), _ neta (Expand Search)
j dna » _ dna (Expand Search), a dna (Expand Search), 1 dna (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 tail complex can ngoc ) OR ( 3 nacl co can ngoc ))) OR ( j dna clamp j neta ))~.
• Adding a wildcard symbol may retrieve word variants: (((( 3 tail complex can ngoc ) or ( 3 nacl co can ngoc ))) or ( j dna clamp j neta ))*.