Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc len cong snippets" » "duc den cong snippets", "duc le cong snippets", "duc len con snippets", "duc lan cong snippets", "duc long cong snippets", "duc tien cong 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 len cong 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 len cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc len cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc len cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.