Talvez deva tentar algumas variações de ortografia:
nuclear rnas » nuclear rna (Expandir a Pesquisa), nucleolar rnas (Expandir a Pesquisa), nucleolar rna (Expandir a Pesquisa)
robles con » robles picon (Expandir a Pesquisa), robles comp (Expandir a Pesquisa), robles c (Expandir a Pesquisa)
3 nuclear » 13 nuclear (Expandir a Pesquisa), 31 nuclear (Expandir a Pesquisa), 3d nuclear (Expandir a Pesquisa)
l robles » a robles (Expandir a Pesquisa), j robles (Expandir a Pesquisa), f robles (Expandir a Pesquisa)
con netw » con net (Expandir a Pesquisa), soc netw (Expandir a Pesquisa), con nee (Expandir a Pesquisa)
oil corn » oil core (Expandir a Pesquisa), oil can (Expandir a Pesquisa), oil coal (Expandir a Pesquisa)
oil con » oil can (Expandir a Pesquisa), oil co (Expandir a Pesquisa), oil cofan (Expandir a Pesquisa)
rnas en » rnas can (Expandir a Pesquisa), rnas eds (Expandir a Pesquisa), rnas era (Expandir a Pesquisa)
en 2d » en 3d (Expandir a Pesquisa), en 20 (Expandir a Pesquisa), en 28 (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• Performing a fuzzy search may retrieve terms with similar spellings: (( j l robles con netw ) or ((( l ((oil con) OR (oil corn)) a new ) or ( 3 nuclear rnas en 2d ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j l robles con netw ) OR ((( l ((oil con) OR (oil corn)) a new ) OR ( 3 nuclear rnas en 2d ))))*.
• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( j l robles con netw ) or ((( l ((oil con) OR (oil corn)) a new ) or ( 3 nuclear rnas en 2d ))))*".