Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh tranh » hanh trinh, hanh trang, lanh tranh
doi chieu » doi chi, ho chieu, mot chieu
doc hieu » toc thieu, hoc thieu, hoc hien
cong cao » cong cau, cong cac, cong co
chat tap » chat tai, chat thai, chat va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) OR (doc hieu)) tach - ((hanh tranh) or (canh tranh)) va nhung cong cao chat tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doc hieu)) tach - ((hanh tranh) OR (canh tranh)) va nhung cong cao chat tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (doc hieu)) tach - ((hanh tranh) or (canh tranh)) va nhung cong cao chat tap".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (doc hieu)) tach - ((hanh tranh) or (canh tranh)) va nhung cong cao chat tap*.