Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
bang cong » dang cong, bang song, hang cong
chong cac » thong cac, chon cac, cong cac
chi sach » chinh sach, chieu sach, co sach
dung cua » dung luan, dung cho
ty chong » ty chung, tac chong, lay chong
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 sach - thanh ((dung cua) or (trung tuan)) bang cong ty chong cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi sach - thanh ((dung cua) OR (trung tuan)) bang cong ty chong cac.
• Adding a wildcard symbol may retrieve word variants: doi chi sach - thanh ((dung cua) or (trung tuan)) bang cong ty chong cac*.