Perhaps you should try some spelling variations:
kxy thuat » ky thuat, ki thuat, my thuat
sach kxy » sach xa, sach kem, sac ky
thuat co » thuat do
tu sach » thu sach, te sach, tu cach
y thuat » ky thuat, my thuat, ki thuat
thuat o » thuat do
su sach » so sach, vu sach
o khi » bo khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sach y thuat o khi ) or ( su sach kxy thuat co khi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach y thuat o khi ) OR ( su sach kxy thuat co khi )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach y thuat o khi ) or ( su sach kxy thuat co khi ))*.