Perhaps you should try some spelling variations:
quyen tap » tuyen tap, luyen tap, quyen cap
cac kieu » cach tieu, cac yeu, tac kiem
bang vat » bang va, dang vat, cang vat
thi cong » tai cong, thien cong
cac chu » cac thu, cac che, cac khu
co bang » cao bang, con bang, co ban
te cong » tai cong, thu cong
vat y » vat ly, vat _

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 ((cac chu) or (cac kieu)) đe co bang vat y ((te cong) or (thi cong)) cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: quyen tap ((cac chu) OR (cac kieu)) đe co bang vat y ((te cong) OR (thi cong)) cong.
• Adding a wildcard symbol may retrieve word variants: quyen tap ((cac chu) or (cac kieu)) đe co bang vat y ((te cong) or (thi cong)) cong*.