Perhaps you should try some spelling variations:
"dong thac san van." » "duong thac san van." (Expand Search), "dong thap san van." (Expand Search), "dong thai san van." (Expand Search), "dong thuc san van." (Expand Search), "dong nhac san van." (Expand Search), "dong thac ban van." (Expand Search), "dong thac luan van." (Expand Search)
"dong tham san van." » "dong thap san van." (Expand Search), "hong tham san van." (Expand Search), "dong tam san van." (Expand Search), "dong tham van van." (Expand Search), "dong than san van." (Expand Search), "dong ham san van." (Expand Search), "dong tham luan van." (Expand Search)
"dong tac doan van." » "cong tac doan van." (Expand Search), "dong tai doan van." (Expand Search), "dong bac doan van." (Expand Search), "dong tap doan van." (Expand Search), "dong tac dan van." (Expand Search), "dong tac doan phan." (Expand Search), "dong tac luan van." (Expand Search), "dong tac tran van." (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: (("dong tac doan van.") OR ((("dong thac san van.") OR ("dong tham san van."))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"dong tac doan van.\") OR (((\"dong thac san van.\") OR (\"dong tham san van.\"))))".
• Removing quotes may allow a broader search: (( dong tac doan van. ) OR ((( dong thac san van. ) OR ( dong tham san van. )))).
• Adding a wildcard symbol may retrieve word variants: (("dong tac doan van.") OR ((("dong thac san van.") OR ("dong tham san van."))))*.