Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
dinh vi » dinh ve, dinh viet, dinh tri
sach ty » sach y, sach tu, sach thu
qua cac » cua cac
nang xa » nang x, lang xa, nang ma
tang ma » mang may, tang van
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua

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 ty ((nang xa) or (tang ma)) hoi. hieu qua cac ((xuc va) OR (luc va)) dinh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty ((nang xa) OR (tang ma)) hoi. hieu qua cac ((xuc va) OR (luc va)) dinh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty ((nang xa) or (tang ma)) hoi. hieu qua cac ((xuc va) OR (luc va)) dinh vi cua tre*".