Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh vai » hanh vi, hanh va, hanh tai
vai cua » dai cua, hai cua, lai cua
su cach » su sach, tu cach, cuu cach
tu nano » truc nano
hieu va » lieu va, hieu qua
nano x » nano 1, nano o
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, duc va
su cac » tu cac, su cao, su can
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su cach) or (su cac)) tu nano x hoi. hieu va cam ((tuc va) OR (tuc xa)) hanh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su cach) OR (su cac)) tu nano x hoi. hieu va cam ((tuc va) OR (tuc xa)) hanh vai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su cach) or (su cac)) tu nano x hoi. hieu va cam ((tuc va) OR (tuc xa)) hanh vai cua viet".
• Adding a wildcard symbol may retrieve word variants: ((su cach) or (su cac)) tu nano x hoi. hieu va cam ((tuc va) OR (tuc xa)) hanh vai cua viet*.