Perhaps you should try some spelling variations:
khuong tinh » chuong trinh, phuong trinh, phuong binh
cong khuong » cong thuong, cong huong, cong khong
nguoi cong » nguoi muong, nguoi thong, nguoi nung
giai toan » giai doan, giai toa, gioi toan
le nguoi » ly nguoi, lam nguoi, den nguoi
tu sach » thu sach, su sach, tu cach
sach va » sach xa, sach dao, sach nha
te sach » toc sach
sach ha » sach nha, sach han, sach xa
ve giai » va giai, ve giao, de giai
va le » va de, vu le
ha ve » pha ve, hua ve, ca ve
thong » trong

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 va le nguoi cong khuong tinh ) or ( te sach ha ve giai toan thong tin ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach va le nguoi cong khuong tinh ) OR ( te sach ha ve giai toan thong tin )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach va le nguoi cong khuong tinh ) or ( te sach ha ve giai toan thong tin ))*.