Perhaps you should try some spelling variations:
mki thuat » ki thuat, mi thuat, my thuat
sach mki » sach moi, bach mai, sach bai
thuat do » thuat o
tu sach » thu sach, su sach, te sach
y thuat » my thuat, kxy thuat, ki thuat
do khi » doi khi, do thi, co khi
tu sac » tu cac, tu san, tu bac
sac ky » cac ky, sai ky

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