Perhaps you should try some spelling variations:
vang trong » lang trong, vung trong, mang trong
doi chieu » doc hieu, doi chi, mot chieu
cong vang » cong lang, cong quang, cong ngang
ho chieu » theo chieu, hoc thieu, mot chieu
cong dan » cong tan, huong dan, cong dong
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: ((ho chieu) or (doi chieu)) tinh - thanh cong vang trong ((cong dan) or (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) tinh - thanh cong vang trong ((cong dan) OR (cong san)) toan cau.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) tinh - thanh cong vang trong ((cong dan) or (cong san)) toan cau*.