Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
chieu tinh » trieu tinh, lieu tinh, chau tinh
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, dieu hanh, hien hanh
tranh va » tranh van, trang va, trinh va
cong tan » cong tac, cong san, cong thanh
tan chan » dan chan, ban chan, can chan
chan cau » phan cau, can cau, chinh cau

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 manh) OR (hieu nganh))) or (chieu tinh)) - canh tranh va nhung cong tan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((((hieu manh) OR (hieu nganh))) OR (chieu tinh)) - canh tranh va nhung cong tan chan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((((hieu manh) OR (hieu nganh))) or (chieu tinh)) - canh tranh va nhung cong tan chan cau".
• Adding a wildcard symbol may retrieve word variants: doc ((((hieu manh) OR (hieu nganh))) or (chieu tinh)) - canh tranh va nhung cong tan chan cau*.