Perhaps you should try some spelling variations:
"tac van cong snippets" » "tac van code snippets", "tac van dong snippets", "tac van phong snippets", "tac phan cong snippets", "tac vang cong snippets", "cac van cong snippets", "tac va 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 ("tac van 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 ("tac van cong snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( python using java snippets ) or ( tac van cong snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using java snippets") or ("tac van cong snippets"))) or ("locating bug core snippets"))*.