Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
cuu cach » cuu cac, cuoc cach, cuu dac
va triet » va thiet, va trien, ve triet
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
tu nano » truc nano
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va hanh » van hanh, va thanh, va danh
nano x » nano 1, nano o

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((cuu cach) or (su sach)) tu nano x ho. hieu ve cham duc va hanh vi ((va triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((cuu cach) OR (su sach)) tu nano x ho. hieu ve cham duc va hanh vi ((va triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: ((cuu cach) or (su sach)) tu nano x ho. hieu ve cham duc va hanh vi ((va triet) or (cua viet))*.