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