Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
luan dong » luan cong, quan dong, luan nong
dong cong » duong cong, dung cong, dang cong
ho chieu » theo chieu, hoc thieu, mot chieu
cong tac » cong ty
tac khan » tac nhan, cac khoan, tac chuan
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: ((ho chieu) OR (doi chieu)) xanh - ((hanh chinh) or (tinh quang)) luan dong cong tac khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) xanh - ((hanh chinh) OR (tinh quang)) luan dong cong tac khan cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (doi chieu)) xanh - ((hanh chinh) or (tinh quang)) luan dong cong tac khan cap".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (doi chieu)) xanh - ((hanh chinh) or (tinh quang)) luan dong cong tac khan cap*.