Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ngoc van le snippets" » "ngo van le snippets", "ngoc lan le snippets", "ngoc tan le snippets", "ngoc van de snippets", "ngoc ban le 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 van le 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 van le snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ngoc van le snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ngoc van le snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.