Perhaps you should try some spelling variations:
sach tranh » canh tranh
tranh nghe » trinh nghe, anh nghe, hanh nghe
nghe duoc » nghiem duoc, nghe nuoi, che duoc
nhiem du » nghiem dau, nhiem huu, nghiem de
duoc hoc » quoc hoi
hiem du » hien du, diem du, hiem duoc
tu sach » thu sach, su sach, te sach
tu sat » tu bat, tu dat, tu hat

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: (( tu sat trach ((nhiem du) OR (hiem du)) hoc ) OR ( tu sach tranh nghe duoc hoc ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu sat trach ((nhiem du) OR (hiem du)) hoc ) or ( tu sach tranh nghe duoc hoc ))~".
• Adding a wildcard symbol may retrieve word variants: (( tu sat trach ((nhiem du) OR (hiem du)) hoc ) or ( tu sach tranh nghe duoc hoc ))*.