Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cong coc tre snippets" » "cong cuoc tre snippets", "cong cac tre snippets", "cong co tre snippets", "cong soc tre snippets", "cong moc tren snippets", "cong hoc tren 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 coc tre 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 coc tre snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong coc tre snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong coc tre snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.