Perhaps you should try some spelling variations:
thuat co » thuat o
va thuat » ki thuat, va thuc, va thiet
thuat do » thuat o
hoach y » hoach xay, hoach yen, hoach su
y thuat » my thuat, kxy thuat, ki thuat
su sach » so sach, vu sach
sach va » sach xa, sach ha, sach dao
tu van » tu va
do khi » doi khi, do thi, 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: (((( tu van ky thuat co khi ) or ( thu hoach y thuat co khi ))) or ( su sach va thuat do khi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( tu van ky thuat co khi ) OR ( thu hoach y thuat co khi ))) OR ( su sach va thuat do khi )).
• Adding a wildcard symbol may retrieve word variants: (((( tu van ky thuat co khi ) or ( thu hoach y thuat co khi ))) or ( su sach va thuat do khi ))*.