Perhaps you should try some spelling variations:
sach hoc » cach hoc, sach hoi, mach hoc
hoc dang » hoc dung, hoc bang, hoc tang
khoi hoc » khoa hoc, hoi hoc, phoi hoc
tinh van » trinh van, dinh van, tinh va
vu sach » vu bach, su sach, vu khach
cuu mon » cuu mo, cuu mot, cuu cong
hoc xa » hoc ma
ho cuu » ho chu, ho cua, so cuu
xa ho » xa hoi, xa hoa, xa hoc

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach hoc tap, nghien cuu mon ((hoc dang) OR (hoc dan)) khoi hoc xa ho cuu tinh van~".
• Adding a wildcard symbol may retrieve word variants: vu sach hoc tap, nghien cuu mon ((hoc dang) OR (hoc dan)) khoi hoc xa ho cuu tinh van*.