Perhaps you should try some spelling variations:
kxy thuat » ky thuat, ki thuat, ky thua
thuat co » thuat o
sach kxy » sach xa, sach kem, sac ky
thuat do » thuat o
my thuat » ky thuat, ki thuat, va thuat
tu sach » thu sach, su sach, te sach
y thuat » ky thuat, ki thuat, va thuat
sach my » sach ty, sach mau, sach moi

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 sach y thuat co khi ) OR ((( tu sach kxy thuat do thi ) OR ( tu sach my thuat do thi ))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu sach y thuat co khi ) or ((( tu sach kxy thuat do thi ) OR ( tu sach my thuat do thi ))))~".
• Adding a wildcard symbol may retrieve word variants: (( tu sach y thuat co khi ) or ((( tu sach kxy thuat do thi ) OR ( tu sach my thuat do thi ))))*.