Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hang doi » hang di, hang loi, huong doi
hieu van » hieu va, thien van, lieu va
sach lo » sach dao, sach doi, sach hoi
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
van cau » van dau, van hau, van chat
doi cua » dai cua, hoi cua
xuc va » tuc va, luc va, xac va

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 ty) OR (sach lo)) nang xa hoi. hieu van cau ((xuc va) OR (duc va)) hang doi cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sach lo)) nang xa hoi. hieu van cau ((xuc va) OR (duc va)) hang doi cua viet~".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach lo)) nang xa hoi. hieu van cau ((xuc va) OR (duc va)) hang doi cua viet*.