Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc hoang do snippets" » "duc hoa do snippets", "duc hung do snippets", "duc thang do snippets", "duc hoang de snippets", "duc hoang da snippets", "duc hoang du 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 hoang do 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 hoang do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc hoang do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc hoang do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.