Perhaps you should try some spelling variations:
"using hoc cong snippets" » "using hoc code snippets", "sinh hoc cong snippets", "using low cong snippets", "ung hoc cong snippets", "using hoc co snippets", "using cac cong snippets", "using hoc dung snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung java java snippets" » "dung va java snippets"

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

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