Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ngu tap cong snippets" » "ngu tmcp cong snippets", "ngu cac cong snippets", "ngu tap co snippets", "ngu lap cong snippets", "ngu phap cong 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: (((("ngu tap cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ngu tap cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ngu tap cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ngu tap cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.