Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty tang » tay tang, ty xang, ty hang
tang ma » mang may, tang van
hieu ve » hieu va, hieu van
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac
luc va » tuc va, loc va
vi cua » vai cua, di cua
cua te » cua tu
ac va » tac va, bac va, mac va

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: tu sach ty tang ma hoi. hieu ve cac ((((luc va) OR (ac va))) OR (duc va)) hanh vi cua te~.
• Adding a wildcard symbol may retrieve word variants: tu sach ty tang ma hoi. hieu ve cac ((((luc va) or (ac va))) or (duc va)) hanh vi cua te*.