Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, hieu quan
trien quang » tran quang, tuyen quang, dien quang
dung luong » dung thuong, dung phuong, dung truong
hanh minh » thanh minh, hinh minh, hanh tinh
minh nhat » minh nhan, trinh nhat, minh chau
dung long » dung cong, dung dong, dung hong
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 quang) OR (trien quang)) - hanh minh nhat ((dung long) or (dung luong)) tinh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((thieu quang) OR (trien quang)) - hanh minh nhat ((dung long) OR (dung luong)) tinh toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((thieu quang) OR (trien quang)) - hanh minh nhat ((dung long) or (dung luong)) tinh toan ban".
• Adding a wildcard symbol may retrieve word variants: toc ((thieu quang) OR (trien quang)) - hanh minh nhat ((dung long) or (dung luong)) tinh toan ban*.