Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
trinh quan » tinh quang, trinh luat, trinh han
hoc thieu » toc thieu, hoc hien
trinh cua » tinh cua, trinh luat, trinh luan
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cau » toan cau, phan cau, than cap

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu quang - hanh ((trinh cua) OR (trinh quan)) trong cong tan than cau~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu quang - hanh ((trinh cua) OR (trinh quan)) trong cong tan than cau*.