Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"luc khong he snippets" » "duc khuong he snippets", "lich khong he snippets", "luc phuong he snippets", "luc khong khi snippets", "luc hong ha snippets", "luc khong _ 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: (((("luc khong he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("luc khong he snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( luc khong he snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luc khong he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.