Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hanh trang » thanh trung, canh tranh, hanh trinh
hoc thieu » toc thieu, hoc hien
trang va » tran van, hang va
cong tan » cong tac, cong thanh, cong ha
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 trang va nhung ((((cong tan) OR (cong ty))) or (cong san)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh trang va nhung ((((cong tan) OR (cong ty))) OR (cong san)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - hanh trang va nhung ((((cong tan) OR (cong ty))) or (cong san)) toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh trang va nhung ((((cong tan) OR (cong ty))) or (cong san)) toan ban*.