Perhaps you should try some spelling variations:
dung cong » dung trong
van chien » van hien, van tien
van hieu » cao hieu
bang vat » bang va, dang vat, cang vat
co bang » cao bang, con bang, co ban
ve dung » ve duong, ve rung, va dung
ly ve » ly va, ly ke
tuyen » truyen, quyen

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

• Performing a fuzzy search may retrieve terms with similar spellings: tuyen tap ((van chien) or (van hieu)) đe co bang vat ly ve dung cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tuyen tap ((van chien) OR (van hieu)) đe co bang vat ly ve dung cong.
• Adding a wildcard symbol may retrieve word variants: tuyen tap ((van chien) or (van hieu)) đe co bang vat ly ve dung cong*.