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 » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
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 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 tan)) khan cap.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh trung da trong ((cong dan) or (cong tan)) khan cap*.