Perhaps you should try some spelling variations:
hieu luat » hieu qua
tinh dung » trinh dung, tin dung, tinh quang
dung quan » dung quang, dung luan, luong quan
tin nang » tin dung, ki nang, thi nang
suat van » suat va, sat van, suat nang
van hieu » cao hieu
quan van » luan van, quan va, quan luan
van he » van hoe, van hue, van de
he moi » ve moi, te moi, he noi

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tin nang suat van hieu luat ) or ( tinh dung quan van he moi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin nang suat van hieu luat ) OR ( tinh dung quan van he moi ))*.