Will I have any problem to enter Norway with one-way-ticket?

I would not suggest you should lie in any way to immigration officers. In any case, you cannot fly direct to Norway from Malaysia, that means you will most likely to fly to another European city before reaching Norway. Either the UK or one of the Schengen members. It is the immigration authorities in these countries that may frown upon the one-way ticket, not in Norway. I understand that due to many ilegal immigrants from Malaysia, the UK is stepping up border control measures.

Hi. Thank you for your opinions. One of the purpose of my visit is to visit my friends, and I don't think I am lying on that too. Nowadays, I can just apply those jobs via email and I don't have to be there. The most important reason I visit my friend there is just 'in case' someone call me for an interview, I am easier to be reached. Of course, I plan to visit around Europe as well during this period. However, I have emailed the Norwegian immigration department to ask about this issue, but they haven't replied.

Another thing is that, I have a student visa of Italy because I was doing my research there until last month. I am not sure whether this helps me to be more 'identified' by the immigration officer which I am not a person who is going for illegal purpose nor overstay.

My flight is from Malaysia-Thailand-Oslo. So I am not going to transit in any European city, fortunately.

This is what the rule is :
Passport required.
- Passport and/or passport replacing documents must be valid
  on arrival.

Visa required, except for A max. stay of 90 days:
- for nationals of Malaysia;

Additional Information:

- As Svalbard is outside the Schengen area, passengers
  traveling to Longyearbyen (LYR) are required to pass through
  passport control at Tromso.
- Valid visas in full, invalidated travel documents are
  accepted provided accompanied by a new travel document.
- Visitors are required to hold proof of sufficient funds to
  cover their stay and documents required for their next
  destination.

- The max. stay is granted within 180 days.
Warning:
- Passports and passport replacing documents issued more than
  10 years prior to date of travel are not accepted.
- Visitors not holding return/onward tickets could be refused
  entry.

I got this from timatic which we use in the airline business. Hope it helps you

Thanks for your information. FYI, I am already in Norway right now, without facing any problem at the immigration. They not even ask about my return. Hehe! I was lucky.