Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dao hieu de snippets" » "cao hieu de snippets", "van hieu de snippets", "bao hiem de snippets", "dao hieu ve snippets", "dao hieu he snippets", "dao hieu le 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: (((("dao hieu de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dao hieu de snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dao hieu de snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dao hieu de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.