Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"wei tang ct1 snippets" » "wei tan ct1 snippets", "wei zhang ct1 snippets", "le tang ct1 snippets", "wei tang ct4 snippets", "wei tang ct5 snippets", "wei tang ct8 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: (((("wei tang ct1 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("wei tang ct1 snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( wei tang ct1 snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("wei tang ct1 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.