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