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