Use conditional query such as IN in OFBiz widget
<set field="inputs.flag[]" value="2" />
<set field="inputs.flag[]" value="1" />
<set field="inputs.flag_op" value="in" />
<set field="searchParameters.win_fld0_value" type="Timestamp" value="1"/>
<set field="searchParameters.win_fld0_op" value="greaterThanEqualTo" type="String"/>
<set field="searchParameters.win_fld1_value" type="Timestamp" value="2"/>
<set field="searchParameters.win_fld1_op" value="greaterThanEqualTo" type="String"/>