Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"thu diem can snippets" » "thu dieu can snippets", "thu dien can snippets", "thi diem can snippets", "thu diem cau snippets", "thu tiem can 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 diem can 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 diem can snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thu diem can snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thu diem can snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.