Perhaps you should try some spelling variations:
tac quang » thac quang, tac quan, tai quang
doanh van » doan van, doanh va, doanh ban
sach tac » sach bac, sach tai, sach tham
quang xa » quan xa, quang ma, quang va
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham luc » cham soc, nhan luc, cham cuu
danh vai » danh sai, danh va, dang van
su sach » so sach, vu sach
cu tren » tu tren, dua tren
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach tac quang xa hoi. hieu van cham luc va ((danh vai) or (doanh van)) cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tac quang xa hoi. hieu van cham luc va ((danh vai) OR (doanh van)) cu tren.
• Adding a wildcard symbol may retrieve word variants: su sach tac quang xa hoi. hieu van cham luc va ((danh vai) or (doanh van)) cu tren*.