Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
cau phuc » cau truc, chau phu, huu phuc
va doanh » van doanh, vay doanh, va danh
so sach » so sanh, bo sach, co sach
dang xa » dang xay, lang xa, dang ha
hieu va » lieu va, hieu qua
cau luc » cau truc
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
y dang » ky dang, 2 dang, _ dang

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y dang xa hoi. hieu va ((cau luc) OR (cau phuc)) va doanh van cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y dang xa hoi. hieu va ((cau luc) OR (cau phuc)) va doanh van cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach y dang xa hoi. hieu va ((cau luc) OR (cau phuc)) va doanh van cua tre*.