Perhaps you should try some spelling variations:
cach thoi » cac thoi, cach thuc, cach noi
hoc doanh » hoa doanh, hoc danh, hoc dan
thoi dai » hoc dai, hoi dap, hoi dan
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
tu cach » tu cac
ca luan » cu luan, ca lua, ca quan
hoi ca » hoi cua, hoi cac, hoi cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cach thoi dai, nghien cuu dong hoc doanh ((khoa hoc) or (hoa hoc)) xa hoi ca luan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach thoi dai, nghien cuu dong hoc doanh ((khoa hoc) OR (hoa hoc)) xa hoi ca luan van.
• Adding a wildcard symbol may retrieve word variants: tu cach thoi dai, nghien cuu dong hoc doanh ((khoa hoc) or (hoa hoc)) xa hoi ca luan van*.