Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh vu » hanh vi, hanh va, hanh tu
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
sac ky » cac ky
bao va » bao ve, ban va, cao va
ve cua » le cua, de cua, te cua
vu va » vu van, tu va, su va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sac ky) OR (sai ky)) nang xa hoi. hieu ve cua ((bao va) OR (tao va)) hanh vu va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sac ky) or (sai ky)) nang xa hoi. hieu ve cua ((bao va) OR (tao va)) hanh vu va triet~".
• Adding a wildcard symbol may retrieve word variants: toc ((sac ky) or (sai ky)) nang xa hoi. hieu ve cua ((bao va) OR (tao va)) hanh vu va triet*.