Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
mang xa » lang xa, mang may, dang xay
cuu tre » cua tre, cau tren, cau treo
xac va » tac va, ac va, bac va
tuc va » thuc va, truc va, tuc xa
vi cuu » vi luu, vinh cuu

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 ((mang xa) or (nang ma)) hoi. hieu va cac ((xac va) or (tuc va)) hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky ((mang xa) OR (nang ma)) hoi. hieu va cac ((xac va) OR (tuc va)) hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ky ((mang xa) or (nang ma)) hoi. hieu va cac ((xac va) or (tuc va)) hanh vi cuu tre*.