Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
cong thanh » dong thanh, cong trinh, cong tan
hieu cach » hieu cac, chieu sach, hieu ca
trung cua » truong cua, trung cap, dung cua
toc hieu » toc thieu, doc hieu, hoc thieu
cong san » cong tac
toan cau » 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: toc hieu cach - thanh ((trung cua) OR (trung tuan)) dung ((cong san) or (cong thanh)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc hieu cach - thanh ((trung cua) OR (trung tuan)) dung ((cong san) OR (cong thanh)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc hieu cach - thanh ((trung cua) OR (trung tuan)) dung ((cong san) or (cong thanh)) toan cau".
• Adding a wildcard symbol may retrieve word variants: toc hieu cach - thanh ((trung cua) OR (trung tuan)) dung ((cong san) or (cong thanh)) toan cau*.