Perhaps you should try some spelling variations:
duong cong » dung cong, luong cong, duong trong
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh cua » doanh cua, manh cua
dong cong » dung cong, dang cong, cong cong
khi sach » khi sac, khoa sach, khau sach
dan khan » dan khanh, dan chan, dan than
khan cap » khan ap, than cap, khoan cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi khi sach - hanh tranh cua ((dong cong) or (duong cong)) dan khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi khi sach - hanh tranh cua ((dong cong) OR (duong cong)) dan khan cap.
• Adding a wildcard symbol may retrieve word variants: doi khi sach - hanh tranh cua ((dong cong) or (duong cong)) dan khan cap*.