Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
va triet » va thiet, va trien, ve triet
cach tu » cach thuc
tu cach » tu cac
vu chat » va chat, ve chat, du chat
hieu vu » hieu va, hieu ve, hieu su
tu nano » truc nano
tuc va » thuc va, truc va, tuc xa
nano o » nano 1, nano cuo, nano mot
xuc va » duc va, luc va, xac va
o ho » o hoc, mo ho, o hoa

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 tu nano o ho. hieu vu chat ((xuc va) or (tuc va)) hanh vi ((va triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach tu nano o ho. hieu vu chat ((xuc va) OR (tuc va)) hanh vi ((va triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: tu cach tu nano o ho. hieu vu chat ((xuc va) or (tuc va)) hanh vi ((va triet) or (cua viet))*.