Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hanh tranh » canh tranh, hanh trinh, hanh trang
hieu manh » chieu xanh, hieu nganh, hien hanh
tranh ha » thanh ha, trang ha, trinh ha
ha thong » hoa thong, nha thong, he thong
dan toan » van toan, dan than, manh toan

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 (dieu hanh)) - hanh tranh ha thong cong ((dan toan) or (anh tuan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu manh) OR (dieu hanh)) - hanh tranh ha thong cong ((dan toan) OR (anh tuan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu manh) OR (dieu hanh)) - hanh tranh ha thong cong ((dan toan) or (anh tuan)) cao".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu manh) OR (dieu hanh)) - hanh tranh ha thong cong ((dan toan) or (anh tuan)) cao*.