Perhaps you should try some spelling variations:
"khoa hoc xa hoc luan van." » "khoa hoc xa hoa luan van." (Expand Search), "khoa hoc xa hoc quan van." (Expand Search), "khoa hoc xa khoa luan van." (Expand Search), "khoa hoc xa hoi luan van." (Expand Search), "khoa hoc va hoc luan van." (Expand Search), "hoa hoc xa hoc luan van." (Expand Search)
"khoa hoc xa hoc luat van." » "khoa hoc xa khoa luat van." (Expand Search), "khoa hoc xa bo luat van." (Expand Search), "khoa hoc xa hoc cua van." (Expand Search), "khoa hoc xa hoc luat vang." (Expand Search), "khoa hoc xa hoc luat dan." (Expand Search), "khoa hoc xa hoc luat va." (Expand Search), "khoa hoc xa hoi luat van." (Expand Search), "khoa hoc va hoc luat van." (Expand Search), "khoa hoc xa hoa luat van." (Expand Search), "hoa hoc xa hoc luat 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: (("khoa hoc xa hoc luan van.") OR ("khoa hoc xa hoc luat van."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"khoa hoc xa hoc luan van.\") OR (\"khoa hoc xa hoc luat van.\"))".
• Removing quotes may allow a broader search: (( khoa hoc xa hoc luan van. ) OR ( khoa hoc xa hoc luat van. )).
• Adding a wildcard symbol may retrieve word variants: (("khoa hoc xa hoc luan van.") OR ("khoa hoc xa hoc luat van."))*.