Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghe cua
nghiep vua » nghiep va, nghiep vu
doanh khoa » toan khoa
hoc doanh » hoa doanh, hoc danh, hoc dan
cac thoi » cac toi, cac hop, cac tro
thoi dai » hoc dai, hoi dap, hoi dan
cong hoc » dong hoc, cong hoa, cong coc
khoa hoc » hoa hoc
van tai » von tai, van tuan
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: tu cac thoi dai, ((nghien cua) or (nghiep vua)) cong hoc doanh khoa hoc xa hoi va van tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac thoi dai, ((nghien cua) OR (nghiep vua)) cong hoc doanh khoa hoc xa hoi va van tai.
• Adding a wildcard symbol may retrieve word variants: tu cac thoi dai, ((nghien cua) or (nghiep vua)) cong hoc doanh khoa hoc xa hoi va van tai*.