Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"luan anh che snippets" » "luan danh che snippets", "tuan anh che snippets", "lan anh che snippets", "luan hanh che snippets", "luan anh cho snippets", "luan nganh 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 anh 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 anh che snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( luan anh che snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luan anh che snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.