Perhaps you should try some spelling variations:
cong thoi » cong thai, cong nhoi, trong thoi
luan hoat » luan hoan, qua hoat, luan khoa
thoi dap » hoi dap, thoi dai, thi dap
luan mot » luan tot, quan mot, cua mot
hoc toan » hoc tan, hop toan, hoa toan
khoa hoc » hoa hoc
van nhan » van phan, van thanh, danh nhan
nhan dan » phan dau, gian dan, nhan tai
hoi van » hoi va, hoi dan, hai van
hoc xa » hoc ma

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu cong thoi dap, nghiep ((luan mot) OR (luan hoat)) hoc toan khoa hoc xa hoi van nhan dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu cong thoi dap, nghiep ((luan mot) OR (luan hoat)) hoc toan khoa hoc xa hoi van nhan dan".
• Adding a wildcard symbol may retrieve word variants: thu cong thoi dap, nghiep ((luan mot) OR (luan hoat)) hoc toan khoa hoc xa hoi van nhan dan*.