Perhaps you should try some spelling variations:
nghien tach » nghiep cach, nghiep sach, nghiem sach
hanh truong » hanh trong, anh truong, manh truong
hoc nghien » hoc hien
truong cua » truong ca, truong quan, truong cao
cua nhung » va nhung
cong tac » cong ty
tuan cau » toan cau, quan cau, thuan cam
tuan cu » tuan tu, quan cua, tuan thu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nghien tach - hanh truong cua nhung ((cong san) OR (cong tac)) ((tuan cau) OR (tuan cu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc nghien tach - hanh truong cua nhung ((cong san) or (cong tac)) ((tuan cau) OR (tuan cu))~".
• Adding a wildcard symbol may retrieve word variants: hoc nghien tach - hanh truong cua nhung ((cong san) or (cong tac)) ((tuan cau) OR (tuan cu))*.