Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"vung dan soc snippets" » "vung dat soc snippets", "dung dan soc snippets", "tung dan soc snippets", "vung dan toc snippets", "vung dan hoc snippets", "vung dan so 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: (((("vung dan soc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("vung dan soc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( vung dan soc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("vung dan soc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.