Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
chau tinh » cuu tinh, ha tinh, cua tinh
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 (((trieu tinh) or (chau 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 (((trieu tinh) OR (chau tinh)))) - canh tranh va nhung cong tan chan cau.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu manh) or (((trieu tinh) or (chau tinh)))) - canh tranh va nhung cong tan chan cau*.