Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den thanh vo snippets" » "de thanh vo snippets", "dinh thanh vo snippets", "dong thanh vo snippets", "den thanh va snippets", "den thanh ve snippets", "den than vo 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: (((("den thanh vo snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("den thanh vo snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( den thanh vo snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("den thanh vo snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.