Perhaps you should try some spelling variations:
hoc chuyen » khong chuyen
xuong hoan » vuong hoang, xuong san, huong hoa
sach tien » sach tren, sach thieu
thuc bach » truc bach, thuc cach, thuoc sach
cong hoan » cong hoa, dong hoa, cong san
tien hoc » tin hoc, tien hoa, dien hoc
bach hoa » bach khoa, bach ha, cach hoan
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 tien hoc chuyen đe ky thuat: kien thuc bach hoa dan ((xuong hoan) OR (cong hoan)) minh~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tien hoc chuyen đe ky thuat: kien thuc bach hoa dan ((xuong hoan) OR (cong hoan)) minh".
• Adding a wildcard symbol may retrieve word variants: tu sach tien hoc chuyen đe ky thuat: kien thuc bach hoa dan ((xuong hoan) OR (cong hoan)) minh*.