Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"vanh dai son snippets" » "van dai son snippets", "vanh tai son snippets", "lanh dao son snippets", "vanh dai so snippets", "vanh doi song snippets", "vanh thai son 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: (((("vanh dai 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: (((("vanh dai son snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( vanh dai son snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("vanh dai son snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.