Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
dinh ve » dinh ket, dinh van
dinh vi » dinh viet, dinh tri, dinh thi
vu cham » va cham, vu kham, tu cham
sach lo » sach dao, sach doi, sach hoi
hieu vu » hieu va, hieu ve, hieu su
nang xa » nang x, lang xa, nang ma
cuu tre » cua tre, cau tren, cau treo
soc va » hoc va, loc va, doc va

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 lo ((nang xa) or (nang cao)) hoi. hieu vu cham soc va ((dinh vi) OR (dinh ve)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach lo ((nang xa) OR (nang cao)) hoi. hieu vu cham soc va ((dinh vi) OR (dinh ve)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach lo ((nang xa) or (nang cao)) hoi. hieu vu cham soc va ((dinh vi) OR (dinh ve)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: vu sach lo ((nang xa) or (nang cao)) hoi. hieu vu cham soc va ((dinh vi) OR (dinh ve)) cuu tre*.