Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hien xanh » hien hanh, hien nhanh, chieu xanh
tranh cua » doanh cua, manh cua
trung cua » truong cua, trung tuan, trung cap
cong tan » cong tac, cong san, cong thanh
tran cau » tran chau, toan cau, tra cau
ran cau » van cau, ban cau, can cau

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