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