Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc toan cai snippets" » "duc tan cai snippets", "duc ton cai snippets", "duc hoan cai snippets", "duc toan cao snippets", "duc toan tai snippets", "duc toan cau 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 toan cai 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 toan cai snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc toan cai snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc toan cai snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.