Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ngoc toan do snippets" » "ngoc tuan do snippets", "ngoc tan do snippets", "ngoc thanh do snippets", "ngoc toan ho snippets", "ngoc toan co snippets", "ngoc toan du 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: (((("ngoc toan do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ngoc toan do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ngoc toan do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ngoc toan do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.