Perhaps you should try some spelling variations:
ki thuat » ky thuat
thuat bo » thuat bao, thuat do, thuat co
tu sach » thu sach, su sach, tu cach
y thuat » ky thuat, my thuat, kxy thuat
te sach » toc sach
sach ki » sach kinh, sach bai, sach kem
thuat o » thuat do
bo khi » co khi, bo chi, bo thi
o thi » do thi, vo thi, lo thi

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 bo khi ) or ( te sach ki thuat o thi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach y thuat bo khi ) OR ( te sach ki thuat o thi )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach y thuat bo khi ) or ( te sach ki thuat o thi ))*.