Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hanh trung » thanh trung, hanh trang, manh trung
hoc thieu » toc thieu, hoc hien
trung da » trung dai, trung dam, truong da
da trong » dat trong, dao trong, dai trong
cong dan » huong dan, cong dong, cong tac
cong san » cong tac
cong tan » cong tac, cong thanh, cong ty
khan cap » khan ap, than cap, khoan cam

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 trung da trong ((((cong dan) OR (cong san))) or (cong tan)) khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh trung da trong ((((cong dan) OR (cong san))) OR (cong tan)) khan cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - hanh trung da trong ((((cong dan) OR (cong san))) or (cong tan)) khan cap".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh trung da trong ((((cong dan) OR (cong san))) or (cong tan)) khan cap*.