Perhaps you should try some spelling variations:
kxy thuat » ki thuat, my thuat, ky thua
thuat cbo » thuat cao, thuat cheo, thuat choi
thuat co » thuat o
sach kxy » sach xa, sach kem, sac ky
thuat do » thuat o
su sach » so sach
sach ky » sac ky, sach y, sach ty
cbo khi » bo khi, cao khai
vu sach » vu bach, vu khach
do khi » doi khi, do thi, bo khi

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 sach ky thuat cbo khi ) OR ( su sach ky thuat co khi ))) OR ( vu sach kxy thuat do khi ))~.
• Adding a wildcard symbol may retrieve word variants: (((( su sach ky thuat cbo khi ) or ( su sach ky thuat co khi ))) or ( vu sach kxy thuat do khi ))*.