Perhaps you should try some spelling variations:
trung tuan » trung thanh, tran tuan, truong thanh
tieu sach » chieu sach, dien sach, te sach
cong dung » cuong dung, cong dong, cong luong
dung nang » dun nang, dung dang, dung quang
nang khan » nang phan, nang han, nang thanh
khan cap » khan ap, than cap, khoan cam

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 - hanh ((trung tuan) or (trung tam)) cong dung nang khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - hanh ((trung tuan) OR (trung tam)) cong dung nang khan cap.
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - hanh ((trung tuan) or (trung tam)) cong dung nang khan cap*.