Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
hanh lai » hanh lam, hanh tai, thanh lap
dat duoc » dat nuoc, da duoc, luat duoc
lai cua » dai cua, hai cua, lai chau
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
y dang » ky dang, _ dang, b dang
2 dang » 2 danh, _ dang, b dang

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 ((y dang) or (2 dang)) ma hoa. hieu van ((dat duoc) or (cam xuc)) va hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((y dang) OR (2 dang)) ma hoa. hieu van ((dat duoc) OR (cam xuc)) va hanh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ((y dang) or (2 dang)) ma hoa. hieu van ((dat duoc) or (cam xuc)) va hanh lai cua tre*.