Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
vi cuu » vi luu, vinh cuu
ve cac » va cac, vien cac

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

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