Talvez deva tentar algumas variações de ortografia:
companion plant » companion plants (Expandir a Pesquisa), companion planting (Expandir a Pesquisa), comparing plant (Expandir a Pesquisa)
neal companies » metal companies (Expandir a Pesquisa), lead companies (Expandir a Pesquisa), coal companies (Expandir a Pesquisa)
companies can » companies case (Expandir a Pesquisa), companies a (Expandir a Pesquisa), companies cut (Expandir a Pesquisa)
nac compared » nacl compared (Expandir a Pesquisa), sac compared (Expandir a Pesquisa), linac compared (Expandir a Pesquisa)
a companion » _ companion (Expandir a Pesquisa)
plant non » planar non (Expandir a Pesquisa), plant n (Expandir a Pesquisa), plant nlr (Expandir a Pesquisa)
can non » dan non (Expandir a Pesquisa), than non (Expandir a Pesquisa)
a neal » a near (Expandir a Pesquisa), a nearly (Expandir a Pesquisa)
j nac » _ nac (Expandir a Pesquisa), a nac (Expandir a Pesquisa), α nac (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 nac compared _ net ) or ((( a neal companies can non ) or ( i a companion plant non ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j nac compared _ net ) OR ((( a neal companies can non ) OR ( i a companion plant non )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j nac compared _ net ) or ((( a neal companies can non ) or ( i a companion plant non ))))*.