Hi Phuoc,
Thank you for using Syncfusion products.
For converting from a Word document to a PDF document kindly include the following "Assemblies"
1.Syncfusion.DocToPDFConverter.Base.dll
2.Syncfusion.DocIO.Base.dll
3.Syncfusion.Pdf.Base.dll
4.Syncfusion.Core.dll
5.Syncfusion.Compression.Base.dll
and following "Namespace"
1.Syncfusion.DocIO;
2.Syncfusion.DocIO.DLS;
3.Syncfusion.DocToPDFConverter;
4.Syncfusion.Pdf;
For more information please refer the following link.
http://help.syncfusion.com/ug_81/Reporting_DocIO/DocToPDF.htmlPlease let us know if you have any questions.
Regards,
Manigandan