Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dap van son snippets" » "dao van son snippets", "tap van son snippets", "dam van son snippets", "dap van dong snippets", "dap van cong snippets", "dap van sung 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: (((("dap van son snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dap van son snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dap van son snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dap van son snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.