Typical way to get higher interest but still must guarantee principal amount is to go for Fixed Deposit. I know of Hong Leong offering 1.3125 + 0.25(promotion) for a 10K 12 month period. It is little but at least it is better than the bank rates.
For those more willing to commit more years, there are so called endowment policy with interest tag to it. Downside is tie you down for 3 - 5 years etc. The protection is basically death and permanent disability not much. This may get you maybe 3 - 4% at the end of 5 yrs period. There are also those long term playing like asset guaranteed plan etc but first need ask yourself you can wait 20 - 25 yrs?

For ppl looking for a quick returns then should go for shares, funds, bonds etc etc.... however those do not guarantee your principal amount.
My conclusion: If my money confirm won't take out, can take out those mid-term endowment policies. If my money confirm won't take out for 1 yr then go for those short term FD. If I want a sum of money at 20 - 25 yrs mark, go for those long term policy.
On top of above, can also try to play a bit of shares or invest in funds. It is always good to put your eggs in many baskets. So for those high risk even if lose not so bad still got those cash in FD and policies.
I am not a financial planner but just a normal citizen doing my own personal way of planning. Others may differ.