Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dao cuong he snippets" » "dai cuong he snippets", "doan cuong he snippets", "cao cong he snippets", "dao cuong ve snippets", "dao cuong le snippets", "dao cuong nghe 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 cuong he 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 cuong he snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dao cuong he snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dao cuong he snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.