Perhaps you should try some spelling variations:
phan hieu » van hieu, phan kien, gian hieu
hieu quan » hieu qua, lieu quan, thien quan
hanh mang » nhanh mang, hanh trang, nhanh lang
tong luan » tang luan, dung luan, hang luan
cong luan » cong tuan, dong luan, cong luong
va thong » va thuong, va phuong, he thong
mang va » mang vua, hang va, bang va

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

• Performing a fuzzy search may retrieve terms with similar spellings: phan hieu quan - hanh mang va thong ((tong luan) or (cong luan)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: phan hieu quan - hanh mang va thong ((tong luan) OR (cong luan)) van ban*.