Perhaps you should try some spelling variations:
hoc viet » hoc hien
thuc dan » thuc hanh, hoc dan, thuc vat
dang mam » dang nam, dang mau, dang mat
thuc va » thuc vat, thuc day
sanh ky » hanh ky, sang ky, nganh ky
so sanh » do sanh
dang ma » dang mau, dang mat, tang ma
hieu ve » hieu va, hieu van
ve nam » he nam, va nam, le nam
vi hoc » li hoc, va hoc

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 ky ((dang ma) or (dang mam)) hoi. hieu ve nam ((thuc va) or (thuc dan)) hanh vi hoc viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ky ((dang ma) OR (dang mam)) hoi. hieu ve nam ((thuc va) OR (thuc dan)) hanh vi hoc viet.
• Adding a wildcard symbol may retrieve word variants: so sanh ky ((dang ma) or (dang mam)) hoi. hieu ve nam ((thuc va) or (thuc dan)) hanh vi hoc viet*.