Perhaps you should try some spelling variations:
sach trien » sach tien, sach tren, sach thieu
doanh ban » doanh bat, doanh van, doanh nhan
hieu van » hieu va, thien van, lieu va
va doanh » van doanh, vay doanh, va danh
cham luc » cham soc, nhan luc, cham cuu
tu sach » thu sach, su sach, te sach
ban cuu » ban cua, ban cau, ban muu
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
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: tu sach trien ((nang xa) OR (lang xa)) hoi. ((hieu ve) or (hieu van)) cham luc va doanh ban cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach trien ((nang xa) OR (lang xa)) hoi. ((hieu ve) OR (hieu van)) cham luc va doanh ban cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach trien ((nang xa) OR (lang xa)) hoi. ((hieu ve) or (hieu van)) cham luc va doanh ban cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach trien ((nang xa) OR (lang xa)) hoi. ((hieu ve) or (hieu van)) cham luc va doanh ban cuu tre*.