Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cong nhat de snippets" » "cong nhan de snippets", "cong ha de snippets", "cong suat de snippets", "cong nhat ve snippets", "cong nhat le snippets", "cong chat deo 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: (((("cong nhat de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong nhat de snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong nhat de snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong nhat de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.