Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu sach » chieu sach, hieu cach, dien sach
trung cap » truong cao, trung tam
cong cong » cong dong, trong cong, dung cong
doc hieu » toc thieu, hoc thieu, hoc hien
cap cong » cac cong, cao cong, tap cong
cong tac » cong ty
nhan san » nhan dan, nha san, han san
nhan van » nhan dan, nhan va, phan van

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 - thanh trung cap cong cong tac ((nhan san) or (nhan van))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - thanh trung cap cong cong tac ((nhan san) OR (nhan van)).
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - thanh trung cap cong cong tac ((nhan san) or (nhan van))*.