Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
dau luoc » dau nuoc, dai luoc, dau luot
nang xa » nang x, lang xa, nang ma
sach va » sach xa, sach ha, sach dao
van dau » van dao, phan dau
sach v » sach y, sach 2, sach vay
de cua » le cua, te cua, dieu 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 va)) nang xa hoi. hieu van dau luoc ((van hanh) OR (ban hanh)) de cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach v) or (sach va)) nang xa hoi. hieu van dau luoc ((van hanh) OR (ban hanh)) de cua viet~".
• Adding a wildcard symbol may retrieve word variants: te ((sach v) or (sach va)) nang xa hoi. hieu van dau luoc ((van hanh) OR (ban hanh)) de cua viet*.