Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
hanh van » thanh van, khanh van, hanh san
lang xa » lang ha, dang xay, lang van
van dau » van dao, phan dau
dau dua » dai dua, dau cua, dau da
dua ban » dia ban, cua ban, qua ban
hanh va » hang va, hanh vi
cuu tre » cua tre, cau tren, cau treo
y lang » o lang, _ lang, tay lang

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 lang xa hoi. hieu van dau dua ban ((hanh van) or (hanh va)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y lang xa hoi. hieu van dau dua ban ((hanh van) OR (hanh va)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc sach y lang xa hoi. hieu van dau dua ban ((hanh van) or (hanh va)) cuu tre*.