Perhaps you should try some spelling variations:
sach nham » sach nha, sach tham, sach han
nham nang » phap nang, cam nang, kha nang
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
doi cua » dai cua, hoi cua
do cua » co cua, de cua, dong cua
luc va » duc va, tuc va, loc va
xuc va » duc va, tuc va, xac va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach nham nang xa hoi. hieu va cac ((xuc va) OR (luc va)) dan ((do cua) or (doi cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach nham nang xa hoi. hieu va cac ((xuc va) OR (luc va)) dan ((do cua) OR (doi cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach nham nang xa hoi. hieu va cac ((xuc va) OR (luc va)) dan ((do cua) or (doi cua)) te".
• Adding a wildcard symbol may retrieve word variants: so sach nham nang xa hoi. hieu va cac ((xuc va) OR (luc va)) dan ((do cua) or (doi cua)) te*.