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