Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hanh trinh » canh tranh, hanh chinh
hoc thieu » toc thieu, hoc hien
trinh cua » tinh cua, trinh luat, trinh quan
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
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.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sang - hanh trinh cua cong ((cong dan) or (cong san)) ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh trinh cua cong ((cong dan) OR (cong san)) ((toan cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh trinh cua cong ((cong dan) or (cong san)) ((toan cau) or (toan cao))*.