Perhaps you should try some spelling variations:
sach hanh » sach danh, sach han, sac hanh
hanh nghe » anh nghe, van nghe, lang nghe
xa nghiem » xet nghiem, van nghiem, va nghien
nghe moi » nghe noi, nghe nuoi, nghe hoa
vu sach » vu bach, su sach, vu khach
moi hoc » hoi hoc, mon hoc, mo hoc
hoc cac » hoc cao
cac xa » tac xa, cac ba, cac xe
d hoc » du hoc, de hoc, y hoc

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( vu sach hanh nghe moi hoc ) OR ( hoc cac xa nghiem ((d hoc) OR (ad hoc)) ))~.
• Adding a wildcard symbol may retrieve word variants: (( vu sach hanh nghe moi hoc ) or ( hoc cac xa nghiem ((d hoc) or (ad hoc)) ))*.