Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"moi le toan snippets" » "moi ke toan snippets", "moi le doan snippets", "moi le tuan snippets", "moi ve toan snippets", "moi la 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: (((("moi 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: (((("moi le toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( moi le toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("moi le toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.