Perhaps you should try some spelling variations:
hoc chuyen » khong chuyen
sach song » sach dung
thuc cach » thuoc sach, truoc cach, thuc hanh
cach khoa » bach khoa, cac khoa, cac khoan
khoa phau » hoa phan, khoa kham, khoa than
song hoc » dong hoc, song ho, song hong
cong xay » thong xay, trong xay, cong tac
tu sach » thu sach, su sach, te sach

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 song hoc chuyen đe ky thuat: kien thuc cach khoa phau ((cong xay) or (cong ty)) tinh~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach song hoc chuyen đe ky thuat: kien thuc cach khoa phau ((cong xay) OR (cong ty)) tinh.
• Adding a wildcard symbol may retrieve word variants: tu sach song hoc chuyen đe ky thuat: kien thuc cach khoa phau ((cong xay) or (cong ty)) tinh*.