Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
chieu sang » chieu sach, chieu xanh, nhieu tang
nhung cong » dung cong, thong cong, hang cong
hieu lang » hieu quang, nhieu tang, hieu van
trinh cua » tinh cua, trinh luat, trinh quan
cua nhung » va nhung
cong tan » cong tac, cong san, cong thanh
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap

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: hai ((hieu lang) OR (chieu sang)) - hanh trinh cua nhung cong tan ((toan cau) OR (toan cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hai ((hieu lang) or (chieu sang)) - hanh trinh cua nhung cong tan ((toan cau) OR (toan cao))~".
• Adding a wildcard symbol may retrieve word variants: hai ((hieu lang) or (chieu sang)) - hanh trinh cua nhung cong tan ((toan cau) OR (toan cao))*.