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