Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
sang tao » hang tai
thuc dan » thuc hanh, hoc dan, thuc vat
sach ty » sach y, sach tu, sach thu
thuc va » thuc vat, thuc day
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
vi cua » vai cua, di cua
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: su sach ty ((sang tao) or (mang may)) hoi. hieu ve nam ((thuc va) or (thuc dan)) hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((sang tao) OR (mang may)) hoi. hieu ve nam ((thuc va) OR (thuc dan)) hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((sang tao) or (mang may)) hoi. hieu ve nam ((thuc va) or (thuc dan)) hanh vi cua viet*.