Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh vai » hanh vi, hanh va, hanh tai
hieu van » hieu va, thien van, lieu va
vai cua » dai cua, hai cua, lai cua
truc va » thuc va, trung va
su sach » so sach, vu sach
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu va
y dang » ky dang, 2 dang, _ dang

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 dang xa hoi. ((hieu ve) OR (hieu van)) cam ((truc va) or (thuc vat)) hanh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y dang xa hoi. ((hieu ve) OR (hieu van)) cam ((truc va) OR (thuc vat)) hanh vai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y dang xa hoi. ((hieu ve) OR (hieu van)) cam ((truc va) or (thuc vat)) hanh vai cua viet".
• Adding a wildcard symbol may retrieve word variants: su sach y dang xa hoi. ((hieu ve) OR (hieu van)) cam ((truc va) or (thuc vat)) hanh vai cua viet*.