Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
nhung cong » dung cong, thong cong, hang cong
hien xanh » hien hanh, hien nhanh, chieu xanh
tranh cua » doanh cua, manh cua
cua nhung » va nhung
dan toan » dan than, manh toan, xuan toan
van toan » van tuan, van tan, van thanh

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