Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"chau van son snippets" » "chu van son snippets", "chao van son snippets", "pham van son snippets", "chau van dong snippets", "chau van cong snippets", "chau 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: (((("chau 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: (((("chau van son snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( chau van son snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("chau van son snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.