Perhaps you should try some spelling variations:
"hang java java snippets" » "hang va java snippets"
"dong trieu code slippers" » "cong trieu code slippers", "dung trieu code slippers", "dong thieu code slippers", "dong trien code slippers", "dong tieu code slippers"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code 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 trieu code slippers") or ("hang java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong trieu code slippers") OR ("hang java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong trieu code slippers ) or ( hang java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong trieu code slippers") or ("hang java java snippets"))) or ("locating bug code snippets"))*.