Perhaps you should try some spelling variations:
hoc viet » hoc hien
va thanh » gia thanh, ban thanh, va tinh
dang mai » dang hai, dang mau, dang bai
nam thuc » nam thuoc, am thuc, nam thu
va dinh » van dinh, va kinh, va tinh
so sanh » do sanh
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ky dang » ky nang, ky danh
bo sach » co sach, hoc sach
vi hoc » li hoc, va hoc
ve nam » he nam, va nam, le nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sanh) or (bo sach)) ky dang mai hoi. hieu ve nam thuc ((va dinh) or (va thanh)) vi hoc viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sanh) OR (bo sach)) ky dang mai hoi. hieu ve nam thuc ((va dinh) OR (va thanh)) vi hoc viet.
• Adding a wildcard symbol may retrieve word variants: ((so sanh) or (bo sach)) ky dang mai hoi. hieu ve nam thuc ((va dinh) or (va thanh)) vi hoc viet*.