Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc san cong snippets" » "duc sang cong snippets", "duc van cong snippets", "duc ban cong snippets", "duc tan cong snippets", "dac san 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 san 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 san cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc san cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc san cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.