Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"luu van toan snippets" » "luu van tuan snippets", "luu van tan snippets", "luu van thanh snippets", "cuu van toan snippets", "luan van toan snippets", "luu hanh 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: (((("luu van 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: (((("luu van toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( luu van toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luu van toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.