I am writing a research proposal. The data - interviews, focus group, and survey. For example, I will look for theme x occurring consistency when theme y does.
Yes Sonya - Mani is correct. Thematic/content analysis is a qualitative technique. You would only use SPSS for descriptive aspects of your survey design. I assume that your interviews are qualitative (un-structured or semi-structured)? Your focus group will be qualitative. It can't be quantitative. Also - it sounds like you are looking for relationships between x and y. That's not what we would normally call themes - but variables. Themes, again, are a qualitative construct.
So - what you would need to be clear about is if you want to use SPSS for the statistical aspects of your survey - or you want to use qualitative software (such as NVivo) for assisting with content or thematic analysis of your interviews and focus group? The attached two chapters on qualitative and quantitative data analysis may assist.
Any of the major software packages will allow you count themes as codes in a spreadsheet format that can then be exported to SPSS. They will also produce code-to-code matrices to show which codes (themes) "co-occur" most frequently.