Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khat hat do snippets" » "khat ha do snippets", "thuat hat do snippets", "khac hau do snippets", "khat hat doi snippets", "khat hat dao snippets", "khat 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: (((("khat 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: (((("khat hat do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khat hat do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khat hat do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.