Perhaps you should try some spelling variations:
nghiem xuan » nghiep luan, nghiep quan, nghiem ban
sach nhiem » trach nhiem, sach nghiep, sach thieu
nhiem nghe » nghiep nghe, hiem ngheo
nghi xuan » ngo xuan, thi xuan
nghe duoc » nghiem duoc, nghe nuoi, che duoc
duoc hoc » quoc hoi
su canh » suc canh, su can, su anh
vu sach » vu bach, su sach, vu khach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su canh tranh ((nghiem xuan) or (nghi xuan)) hoc ) or ( vu sach nhiem nghe duoc hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su canh tranh ((nghiem xuan) OR (nghi xuan)) hoc ) OR ( vu sach nhiem nghe duoc hoc )).
• Adding a wildcard symbol may retrieve word variants: (( su canh tranh ((nghiem xuan) or (nghi xuan)) hoc ) or ( vu sach nhiem nghe duoc hoc ))*.