Talvez debería tentar con algunhas variantes ortográficas:
"sarawak native ras ias." » "sarawak fatin ras ias.", "sarawak five ras ias.", "sarawak native races ias.", "sarawak native grass ias.", "sarawak native iris ias.", "sarawak native ras ras.", "sarawak native rates ias.", "sarawak native ras gaps."
"sarawak native trates iban." » "sarawak fatin trates iban.", "sarawak five trates iban.", "sarawak native trees iban.", "sarawak native tribes iban.", "sarawak native grasses iban.", "sarawak native rates iran.", "sarawak native races iban."

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("sarawak native ras ias.") OR ("sarawak native trates iban."))~.
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• Adding a wildcard symbol may retrieve word variants: (("sarawak native ras ias.") or ("sarawak native trates iban."))*.