Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
doanh van » doan van, doanh va, doanh ban
vay doanh » van doanh, ly doanh, voi doanh
cham luc » cham soc, nhan luc, cham cuu
luc vay » luc va, luc van, luoc van
cua tre » cua te, cua triet, dua tren
tu sach » thu sach, su sach, te sach
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
cuu tre » cau tren, cau treo
y nang » ky nang, ly nang, v nang

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) or (thuoc sach)) y nang xa hoi. hieu ve cham luc vay doanh van ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) y nang xa hoi. hieu ve cham luc vay doanh van ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuoc sach)) y nang xa hoi. hieu ve cham luc vay doanh van ((cua tre) OR (cuu tre))*".