Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hanh tai » thanh tai, hang tai, han tai
sach ty » sach y, sach tu, sach thu
ty lang » tay lang, ty xang, ty hang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
va cau » van cau, va cac, va dau
loc va » hoc va, luc 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 lang xa hoi. hieu va cau ((loc va) or (duc va)) ((hanh tai) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ty lang xa hoi. hieu va cau ((loc va) OR (duc va)) ((hanh tai) OR (hanh vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: thuoc sach ty lang xa hoi. hieu va cau ((loc va) or (duc va)) ((hanh tai) or (hanh vi)) cua tre*.