Perhaps you should try some spelling variations:
dong thanh » truong thanh
hien xanh » hien hanh, hien nhanh, chieu xanh
hanh sinh » hanh tinh, hanh dinh, hinh sinh
cua trung » cua truong, xuan trung, cua nhung
sinh cua » manh cua, dinh cuu, sinh va
cong san » cong tac
toan tap » toan 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 sinh cua trung ((cong san) or (dong thanh)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh sinh cua trung ((cong san) OR (dong thanh)) toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh sinh cua trung ((cong san) or (dong thanh)) toan tap*.