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
hoc thieu » toc thieu, hoc hien
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
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 dan) or (cong tan)) ((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 dan) OR (cong tan)) ((toan ban) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh trinh quan trong ((cong dan) or (cong tan)) ((toan ban) or (toan tap))*.