Perhaps you should try some spelling variations:
quyen tap » tuyen tap, luyen tap, quyen cap
dung cong » dung trong
bang vat » bang va, dang vat, cang vat
thi dung » thi huong, thi nhung, thi cong
cac che » cac he, cac chien, cac chat
ban vat » ben vat, van vat, ban dat
ca chu » cua chu, ca chua, cac chu

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 ((ca chu) or (cac che)) đe co ((((ban vat) OR (ban va))) or (bang vat)) _ thi dung cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: quyen tap ((ca chu) OR (cac che)) đe co ((((ban vat) OR (ban va))) OR (bang vat)) _ thi dung cong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "quyen tap ((ca chu) or (cac che)) đe co ((((ban vat) OR (ban va))) or (bang vat)) _ thi dung cong".
• Adding a wildcard symbol may retrieve word variants: quyen tap ((ca chu) or (cac che)) đe co ((((ban vat) OR (ban va))) or (bang vat)) _ thi dung cong*.