Perhaps you should try some spelling variations:
thu thuat » phau thuat, thu hut
sach thu » sach thue, sach thieu, sach tham
su sach » so sach, vu sach
thuat o » thuat do
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
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 thu thuat o khi ) or ((( so sanh 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 thu thuat o khi ) OR ((( so sanh y thuat o khi ) OR ( su sac ky thuat o khi )))).
• Adding a wildcard symbol may retrieve word variants: (( su sach thu thuat o khi ) or ((( so sanh y thuat o khi ) or ( su sac ky thuat o khi ))))*.