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  <xs:element id="thr_DeferredTaxAssetsIndefiniteOperatingLossCarryforwardsForeign" abstract="false" name="DeferredTaxAssetsIndefiniteOperatingLossCarryforwardsForeign" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="thr_UnrecognizedTaxBenefitsReleaseOfReserves" abstract="false" name="UnrecognizedTaxBenefitsReleaseOfReserves" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="thr_RevenueFromContractWithCustomerExcludingAssessedTaxAdjustment" abstract="false" name="RevenueFromContractWithCustomerExcludingAssessedTaxAdjustment" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="thr_RevenueFromContractWithCustomerExcludingAssessedTaxNetOfAdjustments" abstract="false" name="RevenueFromContractWithCustomerExcludingAssessedTaxNetOfAdjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="thr_SellingGeneralAndAdministrativeExpensesAdjusted" abstract="false" name="SellingGeneralAndAdministrativeExpensesAdjusted" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="thr_SegmentProfitLoss" abstract="false" name="SegmentProfitLoss" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="thr_DeferredCompensationArrangementWithIndividualCompensationIncomeExpense" abstract="false" name="DeferredCompensationArrangementWithIndividualCompensationIncomeExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="thr_UnitedStatesAndLatinAmericaSegmentMember" abstract="true" name="UnitedStatesAndLatinAmericaSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="thr_EuropeMiddleEastAndAfricaSegmentMember" abstract="true" name="EuropeMiddleEastAndAfricaSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="thr_AsiaPacificSegmentMember" abstract="true" name="AsiaPacificSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
