Perhaps you should try some spelling variations:
kham cuu » cham cuu, khao cuu, kham chua
hieu va » lieu va, hieu qua
va kham » va cham, va khao, va tham
nang xa » nang x, lang xa, nang ma
sach v » sach va, sach 2, sach vay
cuu ve » cuu va
ve dan » ke dan, le dan, va dan
va cua » va chua, via cua, ma cua
ca cua » co cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach v) OR (sach y)) nang xa hoi. hieu va kham cuu ve dan ((va cua) OR (ca cua)) te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach v) or (sach y)) nang xa hoi. hieu va kham cuu ve dan ((va cua) OR (ca cua)) te~".
• Adding a wildcard symbol may retrieve word variants: te ((sach v) or (sach y)) nang xa hoi. hieu va kham cuu ve dan ((va cua) OR (ca cua)) te*.