Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach tu » sach thu, cach tu, sach ty
tu mang » tu manh, tu lang, tu quang
may hoi » may thoi, tay hoi, mai hoi
hieu va » lieu va, hieu qua
thu van » thuc van, thuy van, chu van
tu van » tu va
vi cua » vai cua, di cua
cua te » cua tu

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach tu mang may hoi. hieu va cac ((thu van) OR (tu van)) hanh vi cua te~".
• Adding a wildcard symbol may retrieve word variants: toc sach tu mang may hoi. hieu va cac ((thu van) OR (tu van)) hanh vi cua te*.