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