Perhaps you should try some spelling variations:
tranh nghe » trinh nghe, anh nghe, hanh nghe
sach truc » cach thuc, sach tren, sach thu
truc nghe » duc nghe, truc nha, khuc nghe
nghe duoc » nghiem duoc, nghe nuoi, che duoc
thuc canh » thuc hanh, thu canh, thuc cach
toc sach » hoc sach, doc sach, thuoc sach
duoc hoc » quoc hoi

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

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