Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cua viet » ca viet, hoa viet, cua vat
nang xa » nang x, lang xa, nang ma
danh di » danh du, xanh di, danh dien
cua tre » cua te, cuu tre, cua triet
v nang » va nang, vu nang, van nang
va bao » va bai
luc va » duc va, tuc va
sach v » sach va, sach y, sach 2
loc va » hoc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach v nang xa hoi. lieu va bao ((luc va) OR (loc va)) danh di ((cua tre) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach v nang xa hoi. lieu va bao ((luc va) OR (loc va)) danh di ((cua tre) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach v nang xa hoi. lieu va bao ((luc va) OR (loc va)) danh di ((cua tre) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: toc sach v nang xa hoi. lieu va bao ((luc va) OR (loc va)) danh di ((cua tre) or (cua viet))*.