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