Perhaps you should try some spelling variations:
"dung tran cong snippets" » "dung tran code snippets", "dung tren cong snippets", "hung tran cong snippets", "dang tran cong snippets", "dung tran hong snippets", "dung trien cong snippets", "dung tran hoang snippets"
"locating bug core snippets" » "locating bug code snippets"
"hanh java java snippets" » "hanh 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: (((("hanh java java snippets") or ("dung tran cong snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hanh java java snippets") OR ("dung tran cong snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( hanh java java snippets ) or ( dung tran cong snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hanh java java snippets") or ("dung tran cong snippets"))) or ("locating bug core snippets"))*.