Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
quan trong » gian trong
cong thanh » dong thanh, cong trinh, cong tan
hoc thieu » toc thieu, hoc hien
cong san » cong tac
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: hoc thieu sang - hanh trinh quan trong ((cong san) or (cong thanh)) ((toan ban) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh trinh quan trong ((cong san) OR (cong thanh)) ((toan ban) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh trinh quan trong ((cong san) or (cong thanh)) ((toan ban) or (toan tap))*.