Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den chat cua snippets" » "don chat cua snippets", "dinh chat cua snippets", "dung chat cua snippets", "den nhat cua snippets", "den chat va snippets", "den chat huu 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: (((("den chat cua snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("den chat cua snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( den chat cua snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("den chat cua snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.