Perhaps you should try some spelling variations:
giao tinh » giao trinh, gia tinh, giao thanh
doanh cua » doanh luan
tieng han » tieng anh
dieu qua » dieu quan, hieu qua, lieu quan
dieu cua » dieu tra
nhan hoc » nha hoc, nhan hoa, nhan thuc
than hoc » toan hoc, thai hoc, than doc

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

• Performing a fuzzy search may retrieve terms with similar spellings: giao tinh ((dieu qua) or (dieu cua)) doanh cua nguoi viet ((nhan hoc) or (than hoc)) tieng han~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao tinh ((dieu qua) OR (dieu cua)) doanh cua nguoi viet ((nhan hoc) OR (than hoc)) tieng han.
• Adding a wildcard symbol may retrieve word variants: giao tinh ((dieu qua) or (dieu cua)) doanh cua nguoi viet ((nhan hoc) or (than hoc)) tieng han*.