Perhaps you should try some spelling variations:
hoc chuyen » khong chuyen
sach tien » sach tren, sach thieu
thuc danh » thuc hanh, thuc dan, chuc danh
tien hoc » tin hoc, tien hoa, dien hoc
may dinh » may tinh, mai dinh, my dinh
vu sach » vu bach, su sach, vu khach
hoa tan » hoa van, hoa tin, hoa han

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

• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach tien hoc chuyen đe ky thuat: kien thuc danh ((hoa tan) OR (hoa dan)) mang may dinh~.
• Adding a wildcard symbol may retrieve word variants: vu sach tien hoc chuyen đe ky thuat: kien thuc danh ((hoa tan) or (hoa dan)) mang may dinh*.