Perhaps you should try some spelling variations:
nghiem thuoc » nghiem duoc, nghiem hoa, nghi thuc
trach nhiem » trac nghiem
nghiem quoc » nghiem duoc, nghiem nuoc, nghiep quoc
thuoc sach » hoc sach, nuoc sach, thuat sach
sach tranh » canh tranh
ban trach » ban thanh, ban sach, ban mach
nhiem d » nghiem d, nghiem de, nhiem va
tu ban » thu ban, te ban
d hoc » du hoc, ad hoc, de hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu ban trach nhiem d hoc ) or ( thuoc sach tranh ((nghiem quoc) or (nghiem thuoc)) hoi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu ban trach nhiem d hoc ) OR ( thuoc sach tranh ((nghiem quoc) OR (nghiem thuoc)) hoi )).
• Adding a wildcard symbol may retrieve word variants: (( tu ban trach nhiem d hoc ) or ( thuoc sach tranh ((nghiem quoc) or (nghiem thuoc)) hoi ))*.