Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh di » hanh vi, hanh de, hang di
thuc va » thuc dan, thuc day
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
tang ma » tang van
di cua » dai cua, doi cua, de 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 ky ((tang ma) OR (mang may)) hoi. hieu ve nam ((thuc va) or (thuc vat)) hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((tang ma) OR (mang may)) hoi. hieu ve nam ((thuc va) OR (thuc vat)) hanh di cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((tang ma) OR (mang may)) hoi. hieu ve nam ((thuc va) or (thuc vat)) hanh di cua viet*".