Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sang » chieu sach, chieu xanh, hieu lang
hanh trinh » canh tranh, hanh chinh
cong vang » cong lang, cong quang, cong ngang
trinh va » trinh van, trinh vat, trinh ve
va thong » va thuong, va phuong, he thong
cong san » cong tac
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: theo chieu sang - hanh trinh va thong ((cong vang) or (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sang - hanh trinh va thong ((cong vang) OR (cong san)) toan cau*.