Perhaps you should try some spelling variations:
"pvuong trinh hoc dan." » "vuong trinh hoc dan." (Expand Search), "phuong trinh hoc dan." (Expand Search), "chuong trinh hoc dan." (Expand Search), "pvuong trinh hoi dan." (Expand Search), "pvuong trinh khac dan." (Expand Search), "pvuong trinh mon dan." (Expand Search)
"huong trinh doan phan." » "chuong trinh doan phan." (Expand Search), "phuong trinh doan phan." (Expand Search), "vuong trinh doan phan." (Expand Search), "huong trinh doanh phan." (Expand Search), "huong tinh doan phan." (Expand Search), "huong trinh dan phan." (Expand Search), "huong trinh doan thanh." (Expand Search)
"cong trinh tuan van." » "chuong trinh tuan van." (Expand Search), "cong trinh quan van." (Expand Search), "cong trinh xuan van." (Expand Search), "cong trinh quang van." (Expand Search), "cong trinh luan van." (Expand Search), "cong trinh tran van." (Expand Search), "cong trinh tan 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: (((("cong trinh tuan van.") OR ("pvuong trinh hoc dan."))) OR ("huong trinh doan phan."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"cong trinh tuan van.\") OR (\"pvuong trinh hoc dan.\"))) OR (\"huong trinh doan phan.\"))".
• Removing quotes may allow a broader search: (((( cong trinh tuan van. ) OR ( pvuong trinh hoc dan. ))) OR ( huong trinh doan phan. )).
• Adding a wildcard symbol may retrieve word variants: (((("cong trinh tuan van.") OR ("pvuong trinh hoc dan."))) OR ("huong trinh doan phan."))*.