Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doi gen chen snippets" » "doi geng chen snippets", "doi ben chen snippets", "doi ren chen snippets", "do gen chen snippets", "doi dien chen snippets", "doi bien chen snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("doi gen chen snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doi gen chen snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doi gen chen snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doi gen chen snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.