Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"con cuong de snippets" » "con duong de snippets", "cong luong de snippets", "doan cuong de snippets", "con cuong den snippets", "con cuong ve snippets", "con cong de 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: (((("con cuong de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("con cuong de snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( con cuong de snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("con cuong de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.