Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"luan dac che snippets" » "luan danh che snippets", "luan van che snippets", "luan va che snippets", "luan dac cho snippets", "luan cac che snippets", "luan sach che 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: (((("luan dac che snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("luan dac che snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( luan dac che snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luan dac che snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.