Perhaps you should try some spelling variations:
trung thanh » truong thanh
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
trung tuan » trung tam, tran tuan, truong thanh
nhung cong » thong cong, hang cong, nhung don
dung cong » dung trong
dan khan » dan khanh, dan chan, dan than
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 chieu sach - thanh ((trung tuan) or (trung thanh)) ((nhung cong) OR (dung cong)) dan khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - thanh ((trung tuan) OR (trung thanh)) ((nhung cong) OR (dung cong)) dan khan cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - thanh ((trung tuan) or (trung thanh)) ((nhung cong) OR (dung cong)) dan khan cap".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - thanh ((trung tuan) or (trung thanh)) ((nhung cong) OR (dung cong)) dan khan cap*.