Perhaps you should try some spelling variations:
can trinh » can tranh, dan trinh, van trinh
trinh kxy » trinh ky, trinh ly, trinh ke
kxy thuat » ki thuat, my thuat, ky thua
thuat san » thuat toan, thuat song, thuat lanh
sach han » sach tham, sach danh, sach nang
thuat do » thuat o
te sach » toc sach
san hoc » van hoc, dan hoc, san ho
han ky » hanh ky, than ky, nhan ky
do hoc » co hoc, do hoa, du hoc
tu can » tu ban, tu cac, thu canh

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 han ky thuat do hoc ) or ( tu can trinh kxy thuat san hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach han ky thuat do hoc ) OR ( tu can trinh kxy thuat san hoc )).
• Adding a wildcard symbol may retrieve word variants: (( te sach han ky thuat do hoc ) or ( tu can trinh kxy thuat san hoc ))*.