Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
phung cong » nhung cong, nhung chong, dung cong
phong cong » phong chong, thong cong, chong cong
thanh than » thanh thanh, thanh thang, thanh toan
hoc chinh » hoan chinh, hoc sinh, hoc kinh
trung cua » truong cua, trung cap, dung cua
than cap » khan cap, thanh lap, thanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chinh sach - thanh ((trung cua) OR (trung tuan)) ((phung cong) or (phong cong)) thanh than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chinh sach - thanh ((trung cua) OR (trung tuan)) ((phung cong) OR (phong cong)) thanh than cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chinh sach - thanh ((trung cua) OR (trung tuan)) ((phung cong) or (phong cong)) thanh than cap".
• Adding a wildcard symbol may retrieve word variants: hoc chinh sach - thanh ((trung cua) OR (trung tuan)) ((phung cong) or (phong cong)) thanh than cap*.