Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"biet hat do snippets" » "biet nhat do snippets", "biet thoat do snippets", "tiet nhat do snippets", "biet hat doi snippets", "biet hat dao snippets", "biet hat de 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: (((("biet hat do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("biet hat do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( biet hat do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("biet hat do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.