Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"thu hai doan snippets" » "thu thai doan snippets", "thu hai dan snippets", "thu chan doan snippets", "thu ha doan snippets", "thu nhap doan snippets", "thu hang doan 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 hai doan 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 hai doan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( thu hai doan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("thu hai doan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.