Perhaps you should try some spelling variations:
"dong van thinh slippers" » "dong van thanh slippers", "dong van chinh slippers", "dong van minh slippers", "duong van thinh slippers", "dang van thinh slippers", "dong von thinh slippers", "dong van thinh slippery", "dong van thinh 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: (((("dong van thinh 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 thinh slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong van thinh slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong van thinh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.