Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
thanh chau » thanh cha, thanh cham, thanh chu
hien xanh » hien hanh, hien nhanh, chieu xanh
chinh tay » chinh tai, chinh xay, chinh tri
thanh cau » thanh mau, nhanh cau, thanh ca
chinh ta » chinh tai, chinh va, chinh tri
cong san » cong tac

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 ((chinh tay) OR (chinh ta)) phuong cong san ((thanh cau) or (thanh chau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh ((chinh tay) OR (chinh ta)) phuong cong san ((thanh cau) OR (thanh chau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - hanh ((chinh tay) OR (chinh ta)) phuong cong san ((thanh cau) or (thanh chau))".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh ((chinh tay) OR (chinh ta)) phuong cong san ((thanh cau) or (thanh chau))*.