Perhaps you should try some spelling variations:
thoi nghiem » thi nghiem, khoi nghiep, thuc nghiem
nghiem ban » nghiem van, nghiem xuan, nghiep bang
tuan nghia » van nghia
hanh thoi » hanh thuoc, nhanh thai, hanh noi
sach tuan » sach luan, mach tuan, sach quan
cuoc hoi » cuoc khoi, cuoc doi, duoc hoi
co hanh » co thanh, co phanh, co anh
ban hoc » bang hoc, van hoc, bai hoc
bo sach » co sach, hoc sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( co hanh thoi nghiem ban hoc ) or ( bo sach tuan nghia ((cuoc hoi) or (quoc hoi)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( co hanh thoi nghiem ban hoc ) OR ( bo sach tuan nghia ((cuoc hoi) OR (quoc hoi)) )).
• Adding a wildcard symbol may retrieve word variants: (( co hanh thoi nghiem ban hoc ) or ( bo sach tuan nghia ((cuoc hoi) or (quoc hoi)) ))*.