Perhaps you should try some spelling variations:
tran thanh » van thanh, quan thanh
tran tuan » tran quang, tranh luan, tran van
tran xuan » tran quang, tran van
dong cong » duong cong, dung cong, dang cong
ban thanh » ban hanh, ban hang
theo chu » theo chieu, cho chu, chao chu
chu sach » cau sach, thu sach, chieu sach
cong tan » cong tac, cong san, cong thanh

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

• If you are trying to use Boolean operators, they must be ALL CAPS: theo chu sach - thanh ((tran tuan) OR (tran xuan)) dong cong tan ((tran thanh) OR (ban thanh))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chu sach - thanh ((tran tuan) or (tran xuan)) dong cong tan ((tran thanh) OR (ban thanh))~".
• Adding a wildcard symbol may retrieve word variants: theo chu sach - thanh ((tran tuan) or (tran xuan)) dong cong tan ((tran thanh) OR (ban thanh))*.