Perhaps you should try some spelling variations:
sach trach » sach tranh, sach truc, sat trach
vao nghien » va nghien, tam nghien, dau nghien
nghien xu » nghiem xu, nghien cuu, nghiep vu
nche duoc » nghe duoc, cho duoc, che quoc
che duoc » che thuoc, che do, te duoc
anh vao » anh va, anh van, anh giao
su sach » so sach, vu sach
su anh » sua anh, vu anh, tu anh
xu hoc » tu hoc, du hoc, su 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: (( su anh vao nghien xu hoc ) OR ( su sach trach ((nche duoc) OR (che duoc)) hoc ))~.
• Adding a wildcard symbol may retrieve word variants: (( su anh vao nghien xu hoc ) or ( su sach trach ((nche duoc) or (che duoc)) hoc ))*.