Perhaps you should try some spelling variations:
nghiem thuoc » nghiem hoa, nghi thuc, nghiem thi
nghiem duoc » nghe duoc
thu nghiem » thuc nghiem, thi nghiem
khach thi » khach trai, quach thi, nhanh thi
thuoc hoc » thuoc ho, thuoc nhom, thuong hoc
thanh thu » thanh thuy, thanh tu, khanh thu
khac thi » khau thi, khuc thi, khuat thi
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)) nghiem thuoc 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)) nghiem thuoc hoc ) OR ( vu thanh thu nghiem duoc hoi )).
• Adding a wildcard symbol may retrieve word variants: (( vay ((khach thi) or (khac thi)) nghiem thuoc hoc ) or ( vu thanh thu nghiem duoc hoi ))*.