Perhaps you should try some spelling variations:
tail complex » oil complex (Expand Search), atrial complex (Expand Search), basal complex (Expand Search)
complex tran » complex trans (Expand Search), complex tehran (Expand Search), complex trait (Expand Search)
jhon carlos » leon carlos (Expand Search), edson carlos (Expand Search), giron carlos (Expand Search)
carlos now » carlos noe (Expand Search), carlos noa (Expand Search), carlos novo (Expand Search)
null jhon » null jin (Expand Search)
does how » does home (Expand Search), does host (Expand Search), does hiv (Expand Search)
al does » al doped (Expand Search)
5 tail » _ tail (Expand Search), a tail (Expand Search), 3 tail (Expand Search)
3 null » _ null (Expand Search), a null (Expand Search), 1 null (Expand Search)
j al » j a (Expand Search), j l (Expand Search)
ngoc » ngo (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: (( j al does how new ) OR ((( 5 tail complex tran ngoc ) OR ( 3 null jhon carlos now ))))~.
• Adding a wildcard symbol may retrieve word variants: (( j al does how new ) or ((( 5 tail complex tran ngoc ) or ( 3 null jhon carlos now ))))*.