Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
so sanh » do sanh
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
so sach » bo sach, co sach, hoc sach
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac
xuc va » tuc va, luc va, xac va
vi cau » va cau, ve cau, di cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (so sanh)) y nang ma hoi. hieu ve cac ((xuc va) or (duc va)) hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) y nang ma hoi. hieu ve cac ((xuc va) OR (duc va)) hanh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (so sanh)) y nang ma hoi. hieu ve cac ((xuc va) or (duc va)) hanh vi cau tren*.