Perhaps you should try some spelling variations:
trien thuoc » trien thuc, trien thuong, tin thuoc
pham chuong » pham thuong, pham cong, phan thuong
hoc chuyen » khong chuyen
thuoc sach » hoc sach, nuoc sach, thuat sach
chuong may » chuong my, thuong mai, cuong ma
cua khach » cua thanh, nha khach
sach khoa » bach khoa, sach nha, anh khoa
khoa pham » khoa kham, khoa phau, khoa cham
vu khanh » vu thanh, van khanh, duy khanh
kinh hoc » sinh hoc, hinh hoc, tinh hoc
tinh » trinh, dinh, minh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((cua khach) or (vu khanh)) kinh hoc chuyen đe ky thuat: trien thuoc sach khoa pham chuong may tinh~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((cua khach) OR (vu khanh)) kinh hoc chuyen đe ky thuat: trien thuoc sach khoa pham chuong may tinh.
• Adding a wildcard symbol may retrieve word variants: ((cua khach) or (vu khanh)) kinh hoc chuyen đe ky thuat: trien thuoc sach khoa pham chuong may tinh*.