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