Perhaps you should try some spelling variations:
hoc chuyen » khong chuyen
thuc cach » thuoc sach, truoc cach, thuc hanh
cach hoa » cach hoan, cach hoc, bach hoa
hoa phan » hoa dan, co phan
phan ung » phan xuong, phan cong
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
tin hoc » sinh hoc
ung may » dung may, cung may, mang may
tinh » trinh, dinh, kinh

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) OR (su sach)) tin hoc chuyen đe ky thuat: kien thuc cach hoa phan ung may (tinh or minh)~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) tin hoc chuyen đe ky thuat: kien thuc cach hoa phan ung may (tinh OR minh).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) tin hoc chuyen đe ky thuat: kien thuc cach hoa phan ung may (tinh or minh)".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) tin hoc chuyen đe ky thuat: kien thuc cach hoa phan ung may (tinh or minh)*.