Perhaps you should try some spelling variations:
tranh chua » tranh cua, trinh chuan, tranh chap
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
chua bang » chu bang, chua nang, chua xang
luong tai » dung tai, luong va
cong tac » cong ty
toan cao » toan ban, toan tap

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 sang) OR (hieu lang)) - canh tranh chua bang ((luong tai) OR (cong tac)) toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) OR (hieu lang)) - canh tranh chua bang ((luong tai) or (cong tac)) toan cao~".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) OR (hieu lang)) - canh tranh chua bang ((luong tai) or (cong tac)) toan cao*.