Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh chua » tranh cua, trinh chuan, tranh chap
hoc thieu » toc thieu, hoc hien
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
tan ban » toan ban, tang ban, van ban
ban cau » bang cau, ban can, van cau

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 sang - hanh tranh chua ((hang cong) OR (dang cong)) tan ban cau~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh tranh chua ((hang cong) OR (dang cong)) tan ban cau*.