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