Perhaps you should try some spelling variations:
doanh va » doanh tai, doanh cua, hanh va
su sach » vu sach
cau luc » cau truc, cau phuc
cua tre » cua te, cuu tre, cua triet
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
so sach » so sanh, bo sach, co sach
luc va » duc va, tuc va, loc va
va cau » van cau, va cac, va dau

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) or (so sach)) ky dang xa hoi. lieu va cau luc va ((doanh va) OR (doan va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky dang xa hoi. lieu va cau luc va ((doanh va) OR (doan va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ky dang xa hoi. lieu va cau luc va ((doanh va) OR (doan va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky dang xa hoi. lieu va cau luc va ((doanh va) OR (doan va)) cua tre*.