Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den xac cau snippets" » "dan xac cau snippets", "den cac cau snippets", "den xa cau snippets", "den bac cau snippets", "den xac cao 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 xac 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 xac cau snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( den xac cau snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("den xac cau snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.