Perhaps you should try some spelling variations:
hoc chuyen » khong chuyen
sach tren » sach tien, sach tranh
thuc bach » truc bach, thuc cach, thuoc sach
tren hoc » truyen hoc, trung hoc, triet hoc
bach hoa » bach khoa, bach ha, cach hoan
vu sach » vu bach, su sach, vu khach
hoa han » hoa phan, hoa dan, hoa van
han dan » nhan dan, han danh, shan dan
dan may » dam may, dan tay, dat may

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach tren hoc chuyen đe ky thuat: kien thuc bach hoa han dan may (kinh or trinh)~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach tren hoc chuyen đe ky thuat: kien thuc bach hoa han dan may (kinh OR trinh).
• Adding a wildcard symbol may retrieve word variants: vu sach tren hoc chuyen đe ky thuat: kien thuc bach hoa han dan may (kinh or trinh)*.