Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doc trinh le snippets" » "doc tinh le snippets", "doi trinh le snippets", "hoc trinh le snippets", "doc trinh ly snippets", "doc trinh he snippets", "doc trinh ve 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: (((("doc trinh 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: (((("doc trinh le snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doc trinh le snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doc trinh le snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.