Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hanh tranh » canh tranh, hanh trinh, hanh trang
hien xanh » hien hanh, hien nhanh, chieu xanh
tranh cua » doanh cua, manh cua
hang cong » dang cong, hang nong, bang cong
van thanh » ban thanh, van tuan
van toan » van tuan, van tan, 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: hoc hien xanh - hanh tranh cua ((hang cong) or (thong cong)) ((van toan) OR (van thanh)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh tranh cua ((hang cong) OR (thong cong)) ((van toan) OR (van thanh)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - hanh tranh cua ((hang cong) or (thong cong)) ((van toan) OR (van thanh)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh tranh cua ((hang cong) or (thong cong)) ((van toan) OR (van thanh)) cau*.