Perhaps you should try some spelling variations:
dang khoi » dung khoa, hang khoa
sach hoc » cach hoc, sach hoi, mach hoc
hoc dang » hoc dan, hoc dung, hoc bang
khoi hoc » khoa hoc, hoi hoc, phoi hoc
tinh van » trinh van, dinh van, tinh va
su sach » so sach, vu sach
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
xa hoa » xa khoa, xa hoi, ma hoa
xa ho » xa hoi, xa hoc, xa pho

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

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