Perhaps you should try some spelling variations:
duong manh » duong van
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
hanh dung » thanh dung, anh dung, hanh dong
cong manh » cong danh, cong thanh, hoang manh
dung cua » dung luan, dung cho
cua dung » cua dang, cua dong, qua dung
cong tan » cong tac, cong san, cong thanh

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 dung cua dung ((((cong manh) or (duong manh))) or (cong tan)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh dung cua dung ((((cong manh) OR (duong manh))) OR (cong tan)) van ban.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh dung cua dung ((((cong manh) or (duong manh))) or (cong tan)) van ban*.