Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doc nhat moi snippets" » "do nhat moi snippets", "doc chat moi snippets", "hoc nhat moi snippets", "doc nha moi snippets", "doc nhat mpsi snippets", "doc nhap mon 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: (((("doc nhat moi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doc nhat moi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doc nhat moi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doc nhat moi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.