Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
doi chieu » doi chi, ho chieu, mot chieu
tung tuan » hung tuan, quang tuan, trang tuan
cong cong » cong dong, trong cong, dung cong
cong doan » cong dan, cong hoan, dong doanh
doan phan » doanh phan, toan phan, dan phan
doc hieu » toc thieu, hoc thieu, hoc hien

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) OR (doc hieu)) sach - thanh ((tung tuan) or (trung tuan)) cong cong doan phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doc hieu)) sach - thanh ((tung tuan) OR (trung tuan)) cong cong doan phan tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (doc hieu)) sach - thanh ((tung tuan) or (trung tuan)) cong cong doan phan tu".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (doc hieu)) sach - thanh ((tung tuan) or (trung tuan)) cong cong doan phan tu*.