Perhaps you should try some spelling variations:
hoc chuyen » khong chuyen
cach hoan » cac khoan, hach toan, sach han
kinh hoc » sinh hoc, hinh hoc, tinh hoc
cach con » cac cong, cac co, cach noi
phan ung » phan xuong, phan cong
tu sach » thu sach, su sach, te sach
va kinh » va tinh, qua kinh
ung va » dung va, vung va, cung va

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 kinh hoc chuyen đe ky thuat: kien thuc ((cach con) or (cach hoan)) phan ung va kinh~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach kinh hoc chuyen đe ky thuat: kien thuc ((cach con) OR (cach hoan)) phan ung va kinh.
• Adding a wildcard symbol may retrieve word variants: tu sach kinh hoc chuyen đe ky thuat: kien thuc ((cach con) or (cach hoan)) phan ung va kinh*.