Perhaps you should try some spelling variations:
kxmy thuat » ky thuat
kxy thuat » ky thuat, ki thuat, ky thua
my thuat » ky thuat, ki thuat, va thuat
thuat do » thuat o
vu khach » vu khanh, vu khac, vay khach
te sach » toc sach
so sach » so sanh, bo sach, co sach
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) or (my thuat)) do khi ) or ( ((so sach) or (vu khach)) kxy thuat do thi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach ((kxmy thuat) OR (my thuat)) do khi ) OR ( ((so sach) OR (vu khach)) kxy thuat do thi )).
• Adding a wildcard symbol may retrieve word variants: (( te sach ((kxmy thuat) or (my thuat)) do khi ) or ( ((so sach) or (vu khach)) kxy thuat do thi ))*.