Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"qua van son snippets" » "quan van son snippets", "qua ban son snippets", "qua san son snippets", "qua van dong snippets", "qua van cong snippets", "qua van sung 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: (((("qua van son snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("qua van son snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( qua van son snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("qua van son snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.