Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
tranh va » tranh van, trang va, trinh va
cong ban » cong bang, cong san, cong tan
ban hang » ngan hang
hang ban » hang luan, hang va, hang tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((((hieu manh) or (chieu sang))) or (chinh sach)) - canh tranh va nhung cong ban hang ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((hieu manh) OR (chieu sang))) OR (chinh sach)) - canh tranh va nhung cong ban hang ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((((hieu manh) or (chieu sang))) or (chinh sach)) - canh tranh va nhung cong ban hang ban*.