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