Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cham duc » pham duc, cham soc, pham duy
tinh bai » tinh bac, tinh hai, hinh bai
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
cuu tre » cua 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: thuoc sach y nang xa hoi. ((hieu ve) OR (hieu va)) cham duc va ((tinh bai) or (tinh chat)) cuu 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 duc va ((tinh bai) OR (tinh chat)) cuu 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 duc va ((tinh bai) or (tinh chat)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach y nang xa hoi. ((hieu ve) OR (hieu va)) cham duc va ((tinh bai) or (tinh chat)) cuu tre*.