Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
hieu sach » chieu sach, hieu cach, dien sach
trung cap » truong cao, trung tam
cong van » cong vang, cong san, song van
van than » van thanh, van thang, van tuan
than cap » khan cap, thanh lap, thanh cac
hieu ca » hieu cac, hieu cua, hieu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu sach) or (hieu ca)) - thanh ((trung tuan) or (trung cap)) trong cong van than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sach) OR (hieu ca)) - thanh ((trung tuan) OR (trung cap)) trong cong van than cap.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sach) or (hieu ca)) - thanh ((trung tuan) or (trung cap)) trong cong van than cap*.