Perhaps you should try some spelling variations:
"dung hoc cong snippets" » "dung hoc code snippets", "dong hoc cong snippets", "dung thuoc cong snippets", "trung hoc cong snippets", "dung hoc co snippets", "dung cac cong snippets", "dung hoc dung snippets"
"locating bug core snippets" » "locating bug code snippets"
"data using java snippets" » "data 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: (((("data using java snippets") or ("dung hoc cong snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("data using java snippets") OR ("dung hoc cong snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( data using java snippets ) or ( dung hoc cong snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("data using java snippets") or ("dung hoc cong snippets"))) or ("locating bug core snippets"))*.