Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
ty hang » ly hang, thi hang, thu hang
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
ma hoi » mai hoi, xa hoi, ma hoa
ve nam » he nam, va nam, le nam
vi cua » vai cua, di 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 ((ty hang) or (ty xang)) ma hoi. hieu ve nam ((thu ha) or (thuc va)) hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty hang) OR (ty xang)) ma hoi. hieu ve nam ((thu ha) OR (thuc va)) hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: su sach ((ty hang) or (ty xang)) ma hoi. hieu ve nam ((thu ha) or (thuc va)) hanh vi cua viet*.