Perhaps you should try some spelling variations:
cao thuoc » cay thuoc, cua thuoc, nam thuoc
hieu vien » hieu hien, hieu viec, thieu nien
thu bang » thu ban, chu bang, thu trang
thu hang » thi hang, thuc hanh, thu huong
vien cao » vien cac, vien dai, vien da
thuoc va » thuc va, thuoc ma, thuong va
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
va dinh » van dinh, va kinh, va tinh
dinh di » dinh du, dinh vi, danh di
di cua » dai cua, doi cua, de cua

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 ((thu bang) OR (thu hang)) xa hoi. hieu vien cao thuoc va dinh di cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((thu bang) OR (thu hang)) xa hoi. hieu vien cao thuoc va dinh di cua viet".
• Adding a wildcard symbol may retrieve word variants: su sach ((thu bang) OR (thu hang)) xa hoi. hieu vien cao thuoc va dinh di cua viet*.