Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hanh tranh » canh tranh, hanh trang, lanh tranh
hanh trinh » canh tranh, hanh chinh
doi chieu » doc hieu, doi chi, ho chieu
cua nhung » va nhung
cong tac » cong ty
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sang - ((hanh tranh) OR (hanh trinh)) cua nhung ((cong san) or (cong tac)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - ((hanh tranh) OR (hanh trinh)) cua nhung ((cong san) OR (cong tac)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - ((hanh tranh) OR (hanh trinh)) cua nhung ((cong san) or (cong tac)) toan cau".
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - ((hanh tranh) OR (hanh trinh)) cua nhung ((cong san) or (cong tac)) toan cau*.