Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den kha cau snippets" » "den kham cau snippets", "den ha cau snippets", "dien khoa cau snippets", "den pha cau snippets", "den khac hau snippets", "den phan cau 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 kha cau 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 kha cau snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( den kha cau snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("den kha cau snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.