Perhaps you should try some spelling variations:
cua viet » ca viet, cua vat, cua dieu
su sach » so sach, vu sach
ty hang » ly hang, thi hang, thu hang
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
va hoi » xa hoi, va hoc, va hoa
va nam » van nam, ha nam, va nay
thu va » thuc va, thue va, tu va

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)) va hoi. hieu va nam thu va hanh vi ((cua viet) or (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty hang) OR (ty xang)) va hoi. hieu va nam thu va hanh vi ((cua viet) OR (hoa viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty hang) OR (ty xang)) va hoi. hieu va nam thu va hanh vi ((cua viet) or (hoa viet))".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty hang) OR (ty xang)) va hoi. hieu va nam thu va hanh vi ((cua viet) or (hoa viet))*.