Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu xanh » chieu sach, chieu sang, chieu tinh
cong thanh » dong thanh, cong trinh, cong tan
hoc chieu » hoc thieu, ho chieu, hoc hien
trung qua » trung quan, trong qua, trung cua
qua dung » quang dung, su dung, qua song
cong tac » cong ty
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 chieu xanh - thanh trung qua dung ((cong tac) or (cong thanh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu xanh - thanh trung qua dung ((cong tac) OR (cong thanh)) toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc chieu xanh - thanh trung qua dung ((cong tac) or (cong thanh)) toan cao*.