Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hoc danh do snippets" » "hoc dan do snippets", "hoc anh do snippets", "hoc hanh do snippets", "hoc dang do snippets", "hoc danh co snippets", "hoc danh di 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: (((("hoc danh do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hoc danh do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hoc danh do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hoc danh do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.