Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc tranh o snippets" » "duc thanh o snippets", "buc tranh o snippets", "cuoc tranh o snippets", "duc tranh co snippets", "duc trang o snippets", "duc trinh o 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 tranh o 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 tranh o snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc tranh o snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc tranh o snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.