Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
thuat do » thuat o
toc sach » hoc sach, doc sach, thuoc sach
thuat co » thuat o
sach ky » sac ky, sach ty, sach kem
y thuat » my thuat, kxy thuat, va thuat
tu sach » su sach, te sach, tu cach
sach ki » sach kinh, sach bai, sach kem
do khi » doi khi, bo khi, dong khi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu sach ky thuat do khi ) or ((( toc sach y thuat do thi ) or ( tu sach ki thuat co khi ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu sach ky thuat do khi ) OR ((( toc sach y thuat do thi ) OR ( tu sach ki thuat co khi )))).
• Adding a wildcard symbol may retrieve word variants: (( thu sach ky thuat do khi ) or ((( toc sach y thuat do thi ) or ( tu sach ki thuat co khi ))))*.