Perhaps you should try some spelling variations:
"doi dan cong snippets" » "doi dan code snippets", "doi dang cong snippets", "doi van cong snippets", "doi dan dong snippets", "hoi dan cong snippets", "doi ban cong snippets", "doi dau cong snippets"
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("python using java snippets") or ("doi dan cong snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using java snippets") OR ("doi dan cong snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( python using java snippets ) or ( doi dan cong snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using java snippets") or ("doi dan cong snippets"))) or ("locating bug core snippets"))*.