Perhaps you should try some spelling variations:
luyen tap » tuyen tap, luyen thi
hien cong » thien cong, tien cong, chien chong
dien cong » tien cong, dien dong, thien cong
cac khu » cac khoi, cac kieu
cac thu » cach thuc, cac thoi
ban ve » ban va
ve ly » ve ky, ve li, ve y
dong » dung

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: luyen tap ((cac khu) OR (cac thu)) đe co ban ve ly ((hien cong) OR (dien cong)) dong~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "luyen tap ((cac khu) or (cac thu)) đe co ban ve ly ((hien cong) OR (dien cong)) dong~".
• Adding a wildcard symbol may retrieve word variants: luyen tap ((cac khu) or (cac thu)) đe co ban ve ly ((hien cong) OR (dien cong)) dong*.