Perhaps you should try some spelling variations:
kxmy thuat » ky thuat, my thuat
sach kxmy » sach kem
kxy thuat » ky thuat, ki thuat, my thuat
thuat do » thuat o
te sach » toc sach
su sach » so sach
vu sach » vu bach, vu khach
do khi » doi 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: (( te sach kxmy thuat do khi ) or ( ((su sach) OR (vu sach)) kxy thuat do thi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach kxmy thuat do khi ) OR ( ((su sach) OR (vu sach)) kxy thuat do thi )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( te sach kxmy thuat do khi ) or ( ((su sach) OR (vu sach)) kxy thuat do thi ))".
• Adding a wildcard symbol may retrieve word variants: (( te sach kxmy thuat do khi ) or ( ((su sach) OR (vu sach)) kxy thuat do thi ))*.