Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
cong thanh » dong thanh, cong trinh, cong tan
thanh toan » thanh hoa, thanh san, tinh toan
hien xanh » hien hanh, chieu xanh, hien khanh
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
chat cong » chat chong, chat long, chat song
cong cong » cong dong, trong cong, dung cong
toan cao » toan ban, toan tap

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) or (hien nhanh)) - hanh tinh chat cong cong thanh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien nhanh)) - hanh tinh chat cong cong thanh toan cao*.