Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua
han tai » hang tai, nhan tai, van tai
cua tre » cua te, cuu tre, cua triet
va cau » van cau, va cac, va dau
luc 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 ty xang xa hoi. hieu va cau ((luc va) OR (duc va)) ((han tai) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ty xang xa hoi. hieu va cau ((luc va) OR (duc va)) ((han tai) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ty xang xa hoi. hieu va cau ((luc va) OR (duc va)) ((han tai) or (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ty xang xa hoi. hieu va cau ((luc va) OR (duc va)) ((han tai) or (hanh vi)) cua tre*.