Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cong nhat do snippets" » "cong nhan do snippets", "cong ha do snippets", "cong suat do snippets", "cong nhat so snippets", "cong nhat de snippets", "cong hat do 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 do 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 do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong nhat do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong nhat do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.