Perhaps you should try some spelling variations:
kem thuat » kiem thuat, ky thuat, ki thuat
kxy thuat » ky thuat, ki thuat, my thuat
thuat co » thuat do, thuat o
thuat bo » thuat bao, thuat do, thuat o
tu sach » thu sach, tu cach, tu hach
te sach » toc sach
su sach » so sach
vu sach » vu bach, vu khach
bo khi » bo chi, bo thi

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( ((tu sach) OR (te sach)) kem thuat co khi ) or ( ((su sach) or (vu sach)) kxy thuat bo khi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((tu sach) OR (te sach)) kem thuat co khi ) OR ( ((su sach) OR (vu sach)) kxy thuat bo khi )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((tu sach) OR (te sach)) kem thuat co khi ) or ( ((su sach) or (vu sach)) kxy thuat bo khi ))".
• Adding a wildcard symbol may retrieve word variants: (( ((tu sach) OR (te sach)) kem thuat co khi ) or ( ((su sach) or (vu sach)) kxy thuat bo khi ))*.