Perhaps you should try some spelling variations:
kxmy thuat » ky thuat, my thuat
sach kxmy » sach kem
kxy thuat » ky thuat, ki thuat, my thuat
thuat do » thuat o
sach kxy » sach xa, sach kem, sac ky
te sach » toc sach
su sach » so sach, vu sach
do khi » doi khi, co 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: (( te sach kxmy thuat do khi ) or ( su sach kxy thuat do thi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach kxmy thuat do khi ) OR ( su sach kxy thuat do thi )).
• Adding a wildcard symbol may retrieve word variants: (( te sach kxmy thuat do khi ) or ( su sach kxy thuat do thi ))*.