Perhaps you should try some spelling variations:
thuc cach » thuoc sach, truoc cach, thuc hanh
cach hoan » cac khoan, hach toan, sach han
hoan phan » hoa phan, toan phan, doan phan
phan hung » phan chung, phan ung, phan hong
hung dan » huong dan, dung dan, tung dan
dan tinh » doan tinh, dang tinh, dan trinh
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 ((tin hoc) or (sinh hoc)) chuyen đe ky thuat: kien thuc cach hoan phan hung dan tinh~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tin hoc) OR (sinh hoc)) chuyen đe ky thuat: kien thuc cach hoan phan hung dan tinh.
• Adding a wildcard symbol may retrieve word variants: tu sach ((tin hoc) or (sinh hoc)) chuyen đe ky thuat: kien thuc cach hoan phan hung dan tinh*.