Perhaps you should try some spelling variations:
bai thuat » giai thuat, bai thuyet, ki thuat
sach bai » sach dao, cac bai, sach xa
thuat co » thuat do, thuat o
su sach » so sach, vu sach
so sanh » do sanh
y thuat » my thuat, kxy thuat, ki thuat
sanh y » sinh y, anh y, hanh y
su sac » su cac, su xac
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: (((( su sach bai thuat co khi ) or ( so sanh y thuat co khi ))) or ( su sac ky thuat co khi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( su sach bai thuat co khi ) OR ( so sanh y thuat co khi ))) OR ( su sac ky thuat co khi )).
• Adding a wildcard symbol may retrieve word variants: (((( su sach bai thuat co khi ) or ( so sanh y thuat co khi ))) or ( su sac ky thuat co khi ))*.