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