Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
tang dong » tang duong, lang dong, nang dong
chi sach » chinh sach, chieu sach, co sach
trung ca » trung cap, truong ca, trung cua
dong van » duong van, dang van, dong von
doi chi » doi khi
ban dau » bat dau, ban dan, van dau

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 sach - thanh ((trung ca) or (trung tuan)) tang dong van ban dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi sach - thanh ((trung ca) OR (trung tuan)) tang dong van ban dau*.