Perhaps you should try some spelling variations:
van thanh » van tuan
ban thanh » ban hanh, ban hang
cua viet » ca viet, hoa viet, cua vat
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
su sach » so sach, vu sach
y sang » _ sang, duy sang
ma hoi » mai hoi, ma hoa, me hoi
soc va » hoc va, loc va, doc 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: su sach y sang ((ma hoi) or (xa hoi)). lieu ((van thanh) OR (ban thanh)) soc va hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y sang ((ma hoi) OR (xa hoi)). lieu ((van thanh) OR (ban thanh)) soc va hanh di cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y sang ((ma hoi) or (xa hoi)). lieu ((van thanh) OR (ban thanh)) soc va hanh di cua viet".
• Adding a wildcard symbol may retrieve word variants: su sach y sang ((ma hoi) or (xa hoi)). lieu ((van thanh) OR (ban thanh)) soc va hanh di cua viet*.