Perhaps you should try some spelling variations:
hoc chuyen » khong chuyen
sach sinh » sach kinh, sach danh, sach song
thuc cach » thuoc sach, truoc cach, thuc hanh
cach hoa » cach hoan, cach hoc, bach hoa
tan cong » tan cuong, tran cong, toan cong
cong may » cong xay, cong ma, cong hay
tu sach » thu sach, su sach, te sach
hoa tan » hoa dan, hoa van, hoa tin
tinh » trinh, minh, 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 sinh hoc chuyen đe ky thuat: kien thuc cach hoa tan cong may (tinh or dinh)~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach sinh hoc chuyen đe ky thuat: kien thuc cach hoa tan cong may (tinh OR dinh).
• Adding a wildcard symbol may retrieve word variants: tu sach sinh hoc chuyen đe ky thuat: kien thuc cach hoa tan cong may (tinh or dinh)*.