Perhaps you should try some spelling variations:
quyen tai » xuyen tai, nguyen tai, truyen tai
cach thoi » cac thoi, cach thuc, cach noi
thi cong » tai cong, thien cong
cac khu » cac khoi, cac kieu
cac thu » cach thuc, cac thoi
te cong » tai cong, thu cong
ban ve » ban va
ve y » ve ky, ve _, ke y

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

• Performing a fuzzy search may retrieve terms with similar spellings: quyen tai ((((cac khu) or (cach thoi))) or (cac thu)) đe co ban ve y ((te cong) OR (thi cong)) cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: quyen tai ((((cac khu) OR (cach thoi))) OR (cac thu)) đe co ban ve y ((te cong) OR (thi cong)) cong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "quyen tai ((((cac khu) or (cach thoi))) or (cac thu)) đe co ban ve y ((te cong) OR (thi cong)) cong".
• Adding a wildcard symbol may retrieve word variants: quyen tai ((((cac khu) or (cach thoi))) or (cac thu)) đe co ban ve y ((te cong) OR (thi cong)) cong*.