Perhaps you should try some spelling variations:
trien cong » thien cong
quyen tap » tuyen tap, luyen tap, quyen cap
cong cong » cong dong, trong cong, dung cong
trac chu » tran chau, truc chua, tac cho
do trien » do tren, do tien, va trien
cac chu » cac thu, cac che, cac khu
ban ve » ban va
ve do » ve dao, ve doi, va do

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

• Performing a fuzzy search may retrieve terms with similar spellings: quyen tap ((trac chu) or (cac chu)) đe co ban ve do trien cong cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: quyen tap ((trac chu) OR (cac chu)) đe co ban ve do trien cong cong.
• Adding a wildcard symbol may retrieve word variants: quyen tap ((trac chu) or (cac chu)) đe co ban ve do trien cong cong*.