Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
tranh cua » doanh cua, manh cua
tong cong » trong cong, cong cong, dang cong
dung cong » dung trong
dan khanh » dang khanh, van khanh, dat khanh
khanh cac » hanh cac, thanh cac, phan cac
doc hieu » toc thieu, hoc thieu, hoc hien

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu nganh - canh tranh cua ((tong cong) or (dung cong)) dan khanh cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu nganh - canh tranh cua ((tong cong) OR (dung cong)) dan khanh cac*.