Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cong nhat bo snippets" » "cong nhan bo snippets", "cong ha bo snippets", "cong suat bo snippets", "cong nhat so snippets", "cong chat bo snippets", "cong nhat co 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: (((("cong nhat bo snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong nhat bo snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong nhat bo snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong nhat bo snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.