Perhaps you should try some spelling variations:
tham thuat » tam thuat, phau thuat, thu thuat
sach tham » sach nha
su sach » vu sach
thuat o » thuat do
so sach » so sanh, bo sach, co sach
y thuat » my thuat, kxy thuat, ki thuat
su sac » su cac, su xac
sac ky » cac ky, sai ky
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 tham thuat o khi ) or ((( so sach y thuat o khi ) or ( su sac ky thuat o khi ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach tham thuat o khi ) OR ((( so sach y thuat o khi ) OR ( su sac ky thuat o khi )))).
• Adding a wildcard symbol may retrieve word variants: (( su sach tham thuat o khi ) or ((( so sach y thuat o khi ) or ( su sac ky thuat o khi ))))*.