Perhaps you should try some spelling variations:
thuoc cong » truoc cong, thuoc trong, thu cong
quyen tap » tuyen tap, luyen tap, quyen cap
thuc cong » thu cong, chuc cong, thuc con
cac thu » cach thuc, cac thoi
cac che » cac he, cac chien, cac chat
ban vat » bang vat, ben vat, ban va
vat y » vat ly, vat _

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: quyen tap ((cac thu) OR (cac che)) đe co ban vat y ((thuc cong) OR (thuoc cong)) cong~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "quyen tap ((cac thu) or (cac che)) đe co ban vat y ((thuc cong) OR (thuoc cong)) cong~".
• Adding a wildcard symbol may retrieve word variants: quyen tap ((cac thu) or (cac che)) đe co ban vat y ((thuc cong) OR (thuoc cong)) cong*.