Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
trung cua » truong cua, trung tuan, trung cap
ban cong » bang cong, van cong, phan cong
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
tinh » dinh, minh, kinh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((trieu (tinh or trinh)) or (chieu sang)) - thanh trung cua ban cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((trieu (tinh OR trinh)) OR (chieu sang)) - thanh trung cua ban cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: ho ((trieu (tinh or trinh)) or (chieu sang)) - thanh trung cua ban cong tac toan cau*.