Perhaps you should try some spelling variations:
"van hoc than sy van vuong." » "van hoc than sy van cuong." (Expand Search), "van hoc than sy van duong." (Expand Search), "van hoc than sy van chuong." (Expand Search), "van hoc thu sy van vuong." (Expand Search), "van toc thai sy van vuong." (Expand Search), "van hoc tap sy van vuong." (Expand Search), "van hoc tran sy van vuong." (Expand Search), "van hoc than sa van vuong." (Expand Search), "van hoc than hy van vuong." (Expand Search), "van hoc than ly van vuong." (Expand Search)
"van hoa than ky can trong." » "van hoa than ky ban trong." (Expand Search), "van hoa than ky van trong." (Expand Search), "van hoa than ky dan trong." (Expand Search), "van hoa thanh ky can trong." (Expand Search), "van hoa thang ky can trong." (Expand Search), "van hoa nhan ky can trong." (Expand Search), "van hoa than ky chan trong." (Expand Search)

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: (("van hoc than sy van vuong.") OR ("van hoa than ky can trong."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"van hoc than sy van vuong.\") OR (\"van hoa than ky can trong.\"))".
• Removing quotes may allow a broader search: (( van hoc than sy van vuong. ) OR ( van hoa than ky can trong. )).
• Adding a wildcard symbol may retrieve word variants: (("van hoc than sy van vuong.") OR ("van hoa than ky can trong."))*.