Perhaps you should try some spelling variations:
quyen tap » tuyen tap, luyen tap, quyen cap
dung cong » dung trong
tuc dung » thuc dung, tac dung, duc dung
cac chu » cac thu, cac khu, ca chu
cac che » cac he, cac chien, cac chat
san van » tan van, luan van, tran van
ty tuc » ty thuc, ky tuc, ty tu

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 che)) đe co ((san van) or (ban va)) ty tuc dung cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: quyen tap ((cac chu) OR (cac che)) đe co ((san van) OR (ban va)) ty tuc dung cong.
• Adding a wildcard symbol may retrieve word variants: quyen tap ((cac chu) or (cac che)) đe co ((san van) or (ban va)) ty tuc dung cong*.