Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
tinh bai » tinh bac, hinh bai, tinh bao
tinh hai » tinh thai, tinh chat, trinh han
cham luc » cham soc, nhan luc, cham cuu
hieu ve » hieu van
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
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: thuoc sach y nang xa hoi. ((hieu ve) OR (hieu va)) cham luc va ((tinh bai) or (tinh hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y nang xa hoi. ((hieu ve) OR (hieu va)) cham luc va ((tinh bai) OR (tinh hai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y nang xa hoi. ((hieu ve) OR (hieu va)) cham luc va ((tinh bai) or (tinh hai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach y nang xa hoi. ((hieu ve) OR (hieu va)) cham luc va ((tinh bai) or (tinh hai)) cua tre*.