Talvez deva tentar algumas variações de ortografia:
small completing » small competing (Expandir a Pesquisa), small computing (Expandir a Pesquisa), small comparing (Expandir a Pesquisa)
completing tasks » competing task (Expandir a Pesquisa), completion tasks (Expandir a Pesquisa), completion task (Expandir a Pesquisa)
natl compared » nacl compared (Expandir a Pesquisa), nail compared (Expandir a Pesquisa), acl compared (Expandir a Pesquisa)
boy compared » body compared (Expandir a Pesquisa), boys compared (Expandir a Pesquisa), soy compared (Expandir a Pesquisa)
compared a » compare a (Expandir a Pesquisa), compare _ (Expandir a Pesquisa)
tasks non » tasks nova (Expandir a Pesquisa), tasks can (Expandir a Pesquisa), tasks do (Expandir a Pesquisa)
j natl » _ natl (Expandir a Pesquisa), j nail (Expandir a Pesquisa), j nat (Expandir a Pesquisa)
j boy » j boyd (Expandir a Pesquisa), j boys (Expandir a Pesquisa), j body (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( a small completing tasks non ) OR ((( j natl compared a non ) OR ( j boy compared _ non ))))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( a small completing tasks non ) OR ((( j natl compared a non ) OR ( j boy compared _ non ))))*.