Perhaps you should try some spelling variations:
khong cong » thong cong, khong cang, chong cong
hien xanh » hien hanh, hien nhanh, chieu xanh
trinh hua » trinh cua, trinh ha, trinh qua
trinh hoa » trinh do, trinh han
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan ban » van ban

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 ((trinh hua) OR (trinh hoa)) khong cong san toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - hanh ((trinh hua) OR (trinh hoa)) khong cong san toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh ((trinh hua) OR (trinh hoa)) khong cong san toan ban*.