Perhaps you should try some spelling variations:
quyen tap » tuyen tap, luyen tap, huyen tam
quyen cap » quyen cach, huyen cao, quyen con
dung cong » dung trong
thu dung » thuy dung, thuc dung, thu dang
cac khu » cac thu, cac khoi, cac kieu
ve ly » ve ky, ve li, de ly
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 tap) or (quyen cap)) cac khu đe co ban ((ve ly) OR (ve y)) thu dung cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((quyen tap) OR (quyen cap)) cac khu đe co ban ((ve ly) OR (ve y)) thu dung cong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((quyen tap) or (quyen cap)) cac khu đe co ban ((ve ly) OR (ve y)) thu dung cong".
• Adding a wildcard symbol may retrieve word variants: ((quyen tap) or (quyen cap)) cac khu đe co ban ((ve ly) OR (ve y)) thu dung cong*.