Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
tong cong » trong cong, cong cong, dang cong
dung cong » dung trong
chi danh » chi dan, chi anh, chi dinh
tuan thu » toan thuc, van thu
doi chi » doi khi
tuan cu » tuan tu, quan cua, than cua

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: doi chi danh - hanh trinh quan ((tong cong) OR (dung cong)) van ((tuan cu) OR (tuan thu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chi danh - hanh trinh quan ((tong cong) or (dung cong)) van ((tuan cu) OR (tuan thu))~".
• Adding a wildcard symbol may retrieve word variants: doi chi danh - hanh trinh quan ((tong cong) or (dung cong)) van ((tuan cu) OR (tuan thu))*.