Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nao le toan snippets" » "nao ke toan snippets", "nao le doan snippets", "nao le tuan snippets", "nao de toan snippets", "dao le toan snippets", "hao le toan 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: (((("nao le toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nao le toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nao le toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nao le toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.