也許你應該嘗試一些拼寫變化:
computer case » computer based (擴展搜索), computer code (擴展搜索), computer can (擴展搜索)
year compared » years compared (擴展搜索), pcr compared (擴展搜索), mr compared (擴展搜索)
compared laws » compared law (擴展搜索), compared less (擴展搜索), compiled laws (擴展搜索)
acm computer » a computer (擴展搜索), um computer (擴展搜索), uym computer (擴展搜索)
gel compared » model compared (擴展搜索), level compared (擴展搜索), tool compared (擴展搜索)
compared can » compared a (擴展搜索), compared law (擴展搜索), companies can (擴展搜索)
case now » cases now (擴展搜索), case non (擴展搜索), case new (擴展搜索)
can ngoc » van ngoc (擴展搜索), cao ngoc (擴展搜索), tran ngoc (擴展搜索)
laws e » laws _ (擴展搜索), laws a (擴展搜索), laws h (擴展搜索)
i acm » _ acm (擴展搜索), i act (擴展搜索), i ace (擴展搜索)
j gel » j gelb (擴展搜索), j gerl (擴展搜索), _ gel (擴展搜索)

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": "(( i acm computer case now ) OR ((( j gel compared can ngoc ) OR ( a year compared laws e ))))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( i acm computer case now ) OR ((( j gel compared can ngoc ) OR ( a year compared laws e ))))*.