Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dong vat cua snippets" » "dong va cua snippets", "dong von cua snippets", "dong ha cua snippets", "dong mat cua snippets", "dong bat cua snippets", "dong dat cua 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: (((("dong vat cua snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong vat cua snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong vat cua snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong vat cua snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.