Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tay lang » tai lang, tay tang, tay quang
hieu van » hieu va, thien van, lieu va
ban hang » ngan hang
lam chat » luan chat, cao chat, ly chat
vai cua » dai cua, hai cua, lai cua
van lam » van nam
lang xa » lang ha, dang xay, lang van
cua tu » cua tuc, cua su, cua cu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) tay lang xa hoi. hieu van lam chat ((ban hanh) OR (ban hang)) vai cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) tay lang xa hoi. hieu van lam chat ((ban hanh) or (ban hang)) vai cua tu~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) tay lang xa hoi. hieu van lam chat ((ban hanh) or (ban hang)) vai cua tu*.