Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc xung so snippets" » "duc hung so snippets", "duc dung so snippets", "duc tung so snippets", "duc tuong so snippets", "duc muong 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: (((("duc xung 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: (((("duc xung so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc xung so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc xung so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.