Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
lam duoc » nam duoc, luat duoc, lam thuoc
sach ty » sach y, sach tu, sach thu
ty lang » tay lang, ty xang, ty hang
lang xa » lang ha, dang xay, lang van
van lam » van nam
va hang » van hang, va lang, va hanh
va nang » van nang, da nang, cam nang
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty lang xa hoi. hieu van lam duoc ((va hang) or (va nang)) va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty lang xa hoi. hieu van lam duoc ((va hang) OR (va nang)) va cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ty lang xa hoi. hieu van lam duoc ((va hang) or (va nang)) va cua tre*.