Perhaps you should try some spelling variations:
quang quan » quang tuan, quang uan, quan quan
dung thong » dung thuong, dung trong, dong thong
thong van » trong van, thong va, thong quan
hieu truc » hieu thuc, hieu tuc, hieu thuoc
bien hoat » bien hoai, dien hoat, trien hoat
van hieu » cao hieu
quan doi » quan tri, quan li
doi bien » doi dien, voi bien, doi hien

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tin dung thong van hieu truc ) or ( tinh quang quan doi bien hoat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung thong van hieu truc ) OR ( tinh quang quan doi bien hoat ))*.