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
doc hieu » toc thieu, hoc thieu, hoc hien
dan hanh » dang hanh, dan khanh, dan thanh
hanh cac » hang cac, hanh cat, hanh cham

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 hanh cac~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu nganh - canh tranh cua ((tong cong) OR (dung cong)) dan hanh cac*".