Perhaps you should try some spelling variations:
nghiem xu » nghiem su, nghiem xuan, nghiem ngu
ngo xuan » ngo van
sach thi » sach thu, sach tai, sach thieu
che duoc » che thuoc, che do, te duoc
duoc hoc » quoc hoi
su canh » suc canh, su can, su anh
vu sach » vu bach, su sach, vu khach
thi che » tai che, thi chien, thi chieu

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 xu) or (ngo xuan)) hoc ) or ( vu sach thi che duoc hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su canh tranh ((nghiem xu) OR (ngo xuan)) hoc ) OR ( vu sach thi che duoc hoc )).
• Adding a wildcard symbol may retrieve word variants: (( su canh tranh ((nghiem xu) or (ngo xuan)) hoc ) or ( vu sach thi che duoc hoc ))*.