Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
thuc day » thuc dan, thuc vat
hanh di » hanh vi, hanh de, hang di
sach ky » sac ky, sach y, sach kem
lang xa » lang ha, dang xay, lang van
sach ty » sach y, sach tu, sach thu
van cau » van dau, van hau, van chat
bac va » ban va, bac ha, bao va
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: so ((sach ky) or (sach ty)) lang xa hoi. hieu van cau ((bac va) or (thuc day)) hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ky) OR (sach ty)) lang xa hoi. hieu van cau ((bac va) OR (thuc day)) hanh di cua viet.
• Adding a wildcard symbol may retrieve word variants: so ((sach ky) or (sach ty)) lang xa hoi. hieu van cau ((bac va) or (thuc day)) hanh di cua viet*.