Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hoc nganh » hoc nhanh
cau tren » cu tren, dau tren, ca tren
nang ma » tang ma, sang ma, nang cao
danh di » danh du, danh dien, danh gia
xanh di » vanh dai, xanh tai
hieu va » lieu va, hieu qua
v nang » va nang, vu nang, van nang
ma hoi » mai hoi, xa hoi, ma hoa
va coc » va cuoc, va cac, va hoc
luc va » duc va, tuc va, loc 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: ((thuoc sach) OR (hoc nganh)) v nang ma hoi. hieu va coc luc va ((danh di) OR (xanh di)) cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc sach) or (hoc nganh)) v nang ma hoi. hieu va coc luc va ((danh di) OR (xanh di)) cau tren~".
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (hoc nganh)) v nang ma hoi. hieu va coc luc va ((danh di) OR (xanh di)) cau tren*.