Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc cao so snippets" » "duc dao so snippets", "doc cao so snippets", "duc bao so snippets", "duc cao son snippets", "duc co so snippets", "duc cao su 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 cao 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 cao so snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc cao so snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc cao so snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.