Perhaps you should try some spelling variations:
"cong tac doan van." » "cong tac dan van." (Expand Search), "cong tai doan van." (Expand Search), "cong tac toan van." (Expand Search), "cong tac doan phan." (Expand Search), "cong tac san van." (Expand Search), "cong tac tran van." (Expand Search)
"cong tap doan van." » "cong tap doan phan." (Expand Search), "cong tap san van." (Expand Search), "cong tap tran van." (Expand Search), "chong tap doan van." (Expand Search), "cuong tap doan van." (Expand Search), "tong tap doan van." (Expand Search), "cong van doan van." (Expand Search), "cong tap dia van." (Expand Search)
"cong tac luan van." » "cong thac luan van." (Expand Search), "cong tac quan van." (Expand Search), "cong bac luan van." (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("cong tac doan van.") OR ("cong tac luan van."))) OR ("cong tap doan van."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"cong tac doan van.\") OR (\"cong tac luan van.\"))) OR (\"cong tap doan van.\"))".
• Removing quotes may allow a broader search: (((( cong tac doan van. ) OR ( cong tac luan van. ))) OR ( cong tap doan van. )).
• Adding a wildcard symbol may retrieve word variants: (((("cong tac doan van.") OR ("cong tac luan van."))) OR ("cong tap doan van."))*.