Perhaps you should try some spelling variations:
"giang van dat slippers" » "hoang van dat slippers", "dang van dat slippers", "gian dan dat slippers", "giang van dao slippers", "giang van dau slippers", "giang dan dat slippers", "giang van dat slippery", "giang van dat grippers"
"dung java java snippets" » "dung va java snippets"
"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: (((("giang van dat slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("giang van dat slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( giang van dat slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("giang van dat slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.