Perhaps you should try some spelling variations:
tieu sach » chieu sach, dien sach, te sach
trung vat » trung va, trung van, trong vat
trong dat » trong dam, trong dan, trong dao
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
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: theo tieu sach - thanh ((trung vat) or (trong dat)) dung cong tan than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - thanh ((trung vat) OR (trong dat)) dung cong tan than cap.
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - thanh ((trung vat) or (trong dat)) dung cong tan than cap*.