Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"tham duy so snippets" » "pham duy so snippets", "tham du so snippets", "pham duc so snippets", "tham duy son snippets", "tham duc so snippets", "tham duy ro 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: (((("tham duy so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tham duy so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tham duy so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tham duy so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.