Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"len cong hoc snippets" » "den cong hoc snippets", "le cong hoc snippets", "len con hoc snippets", "len dong hoc snippets", "len cong hoa snippets", "len cong coc 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 cong hoc 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 cong hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( len cong hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("len cong hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.