Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van cuong do snippets" » "van chuong do snippets", "van duong do snippets", "van cong do snippets", "van cuong dao snippets", "van cuong vo snippets", "van luong do 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: (((("van cuong do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van cuong do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van cuong do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van cuong do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.