Piav qhia:
1. qhov rai ntxuav muaj lub luag haujlwm tiv thaiv rau qhov chaw siv.
2. siv cov khoom siv tiv thaiv ib puag ncig
3. patent tsim khoom
Xa koj cov lus rau peb:
Sau koj cov lus ntawm no thiab xa tuaj rau peb
Piav qhia:
1. qhov rai ntxuav muaj lub luag haujlwm tiv thaiv rau qhov chaw siv.
2. siv cov khoom siv tiv thaiv ib puag ncig
3. patent tsim khoom
