Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
trung cua » truong cua, trung cap, dung cua
chi sang » chi lang, chieu sang, chi chang
tong tap » tuong tac, trong tan, tong hop
cong tac » cong ty
toan cau » toan cao, toan ban, toan tap
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi sang - thanh ((trung cua) or (trung tuan)) nhung ((tong tap) or (cong tac)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi sang - thanh ((trung cua) OR (trung tuan)) nhung ((tong tap) OR (cong tac)) toan cau.
• Adding a wildcard symbol may retrieve word variants: doi chi sang - thanh ((trung cua) or (trung tuan)) nhung ((tong tap) or (cong tac)) toan cau*.