Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hanh trinh » canh tranh, hanh chinh
trinh tuan » trinh quan, trinh toan, trinh luan
tuan nhung » quan nhung, tuan hung, thuat nhung
cong thanh » dong thanh, cong trinh, truong thanh
cong tan » cong tac, cong san, 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: toc thieu sang - hanh trinh tuan nhung ((cong tan) or (cong thanh)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu sang - hanh trinh tuan nhung ((cong tan) OR (cong thanh)) toan cau.
• Adding a wildcard symbol may retrieve word variants: toc thieu sang - hanh trinh tuan nhung ((cong tan) or (cong thanh)) toan cau*.