Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dong van anh slippers" » "duong van anh slippers", "dang van anh slippers", "dong von anh slippers", "dong van thanh slippers", "dong van minh slippers", "dong tuan anh slippers", "dong van anh slippery", "dong van anh grippers"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core 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 van anh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong van anh slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong van anh slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong van anh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.