Perhaps you should try some spelling variations:
tru nang » tra nang, tri nang, truc nano
tu cach » tu cac
hieu ve » hieu van
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
su cac » tu cac, su cao, su can
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua
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: ((tu cach) or (su cac)) tru nang x hoi. ((hieu ve) OR (hieu va)) cam xuc va hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (su cac)) tru nang x hoi. ((hieu ve) OR (hieu va)) cam xuc va hanh vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (su cac)) tru nang x hoi. ((hieu ve) OR (hieu va)) cam xuc va hanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (su cac)) tru nang x hoi. ((hieu ve) OR (hieu va)) cam xuc va hanh vi cua vat*.