Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
tang quang » dang quang, tang quan, thong quang
hang quang » dang quang, hong quang, hang quan
hieu manh » chieu xanh, hieu nganh, dieu hanh
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
tan van » tran van, tang van, luan van
van cau » van dau, van hau, van chat

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: ho ((hieu manh) OR (chieu tinh)) - hanh ((tang quang) OR (hang quang)) dung cong tan van cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu manh) or (chieu tinh)) - hanh ((tang quang) OR (hang quang)) dung cong tan van cau~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu manh) or (chieu tinh)) - hanh ((tang quang) OR (hang quang)) dung cong tan van cau*.