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