Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc tang lon snippets" » "duc thang lon snippets", "duc tan lon snippets", "tuc tang lon snippets", "duc tang loi snippets", "duc tang lop snippets", "duc tang son 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 tang lon 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 tang lon snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc tang lon snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc tang lon snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.