Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
nang quan » ban quan
dong cong » duong cong, dung cong, dang cong
ho chieu » theo chieu, doi chieu, mot chieu
cong san » cong tac
san than » sang than, san thanh, ban than
than cap » khan cap, thanh lap, thanh cac

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: ((ho chieu) OR (hoc thieu)) xanh - ganh ((nang quan) OR (nang suat)) dong cong san than cap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (hoc thieu)) xanh - ganh ((nang quan) or (nang suat)) dong cong san than cap~".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (hoc thieu)) xanh - ganh ((nang quan) or (nang suat)) dong cong san than cap*.