Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hanh trinh » canh tranh, hanh chinh
trinh han » trinh quan
han trong » hanh trong, nhan trong, phan trong
cong san » cong tac
cong tan » cong tac, cong thanh, cong ty
toan ban » van ban

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 han trong ((cong san) or (cong tan)) ((toan ban) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu sang - hanh trinh han trong ((cong san) OR (cong tan)) ((toan ban) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: toc thieu sang - hanh trinh han trong ((cong san) or (cong tan)) ((toan ban) or (toan tap))*.