Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den quoc cac snippets" » "dan quoc cac snippets", "de quoc cac snippets", "den buoc cac snippets", "den duoc cac snippets", "den luoc cac snippets", "den quoc cao 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: (((("den quoc cac snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("den quoc cac snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( den quoc cac snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("den quoc cac snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.