Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cong cac den snippets" » "cuong cac den snippets", "cong tac den snippets", "cong cau den snippets", "cong cac dan snippets", "cong cac don snippets", "cong cac nen 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: (((("cong cac 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: (((("cong cac den snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong cac den snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong cac den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.