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