Perhaps you should try some spelling variations:
khoan khoa » khuan khoa, khoa khoa, toan khoa
trinh theo » trich theo, tinh theo, trinh thao
khoa thong » hoa thong, thoai thong, pho thong
thuat lap » thuat lanh, thuat xay, thuat bai
sach tri » sach tai, sach tren, sach truc
dac khoa » da khoa, dai khoa, dau khoa
theo cac » tho cac, theo cap, theo sach
te sach » toc sach
tue dac » thue dat
khoa he » hoa he, khoa hoc, khong he

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 tri tue dac khoa he thong ) or ( thuat lap trinh theo cac khoan khoa thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach tri tue dac khoa he thong ) OR ( thuat lap trinh theo cac khoan khoa thong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach tri tue dac khoa he thong ) or ( thuat lap trinh theo cac khoan khoa thong ))*.