Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"luan han tre snippets" » "luan hoan tre snippets", "luan phan tre snippets", "luan van tre snippets", "luan ban tre snippets", "luan hang tren snippets", "luan nhan tren 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 han tre 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 han tre snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( luan han tre snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luan han tre snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.