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