Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, truong thanh
thong cong » trong cong, tong cong, thong thong
tran tuan » tran xuan, tran quang, tran thanh
cua tinh » cua sinh, va tinh, hoa tinh
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
ha tinh » va tinh, may tinh

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

• Performing a fuzzy search may retrieve terms with similar spellings: o ((ha tinh) or (cua tinh)) - thanh ((trung tuan) OR (tran tuan)) thong cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: o ((ha tinh) OR (cua tinh)) - thanh ((trung tuan) OR (tran tuan)) thong cong tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "o ((ha tinh) or (cua tinh)) - thanh ((trung tuan) OR (tran tuan)) thong cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: o ((ha tinh) or (cua tinh)) - thanh ((trung tuan) OR (tran tuan)) thong cong tac toan cau*.