Perhaps you should try some spelling variations:
"using tran cong snippets" » "using tran code snippets", "using raw cong snippets", "using fortran cong snippets", "using tran hong snippets", "using trien cong snippets", "using tran hoang snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung java java snippets" » "dung va java 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: (((("using tran 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 tran cong snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( using tran cong snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using tran cong snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.