Perhaps you should try some spelling variations:
nghiem duoc » nghiem thuoc, nghe duoc
thu nghiem » thuc nghiem, thi nghiem
khach thi » khach trai, quach thi, nhanh thi
nghi thuc » nghe thuc
thanh thu » thanh thuy, thanh tu, khanh thu
khac thi » khau thi, khuc thi, khuat thi
thuc hoc » phuc hoc, thu hoc, thuc uoc
vu thanh » su thanh, vu khanh, cuu thanh
duoc hoi » quoc hoi, duoc hoc, duoc si

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( vay ((khach thi) or (khac thi)) nghi thuc hoc ) or ( vu thanh thu nghiem duoc hoi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( vay ((khach thi) OR (khac thi)) nghi thuc hoc ) OR ( vu thanh thu nghiem duoc hoi )).
• Adding a wildcard symbol may retrieve word variants: (( vay ((khach thi) or (khac thi)) nghi thuc hoc ) or ( vu thanh thu nghiem duoc hoi ))*.