Perhaps you should try some spelling variations:
doanh van » doanh va, doanh ban, doanh nhan
cau tren » cu tren, dau tren, ca tren
doan van » doan va, hoang van, luan van
cham luc » cham soc, nhan luc, cham cuu
te sach » toc sach
hieu su » hieu sau, tieu su, hieu so
ly hang » ly quang
ty hang » ty xang, thi hang, thu hang
su cham » su pham, tu cham, vu cham
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: te sach ((ty hang) or (ly hang)) xa hoi. hieu su cham luc va ((doanh van) OR (doan van)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty hang) OR (ly hang)) xa hoi. hieu su cham luc va ((doanh van) OR (doan van)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty hang) or (ly hang)) xa hoi. hieu su cham luc va ((doanh van) OR (doan van)) cau tren".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty hang) or (ly hang)) xa hoi. hieu su cham luc va ((doanh van) OR (doan van)) cau tren*.