Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, ho chieu
hoc thieu » toc thieu, hoc hien
canh benh » can benh, canh binh, cac benh
chua dang » cua dang, chua dong, chua xang
chua nang » chuc nang, chua xang, kha nang
cong dan » cong san, cong tan, huong dan
dan han » dan chan, dan than, dan hanh
han tu » phan tu, hanh tu, ban tu

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (hoc thieu)) xanh - canh benh ((chua dang) OR (chua nang)) cong dan han tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (hoc thieu)) xanh - canh benh ((chua dang) OR (chua nang)) cong dan han tu~".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (hoc thieu)) xanh - canh benh ((chua dang) OR (chua nang)) cong dan han tu*.