Perhaps you should try some spelling variations:
sach hoi » sach doi, sach moi, cach thoi
va cham » va chat, va tham
hieu va » lieu va, hieu qua
sach lo » sach dao, sach doi, sach moi
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((sach lo) OR (sach hoi)) nang xa hoi. hieu va cham ((luc va) or (tuc xa)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach lo) OR (sach hoi)) nang xa hoi. hieu va cham ((luc va) OR (tuc xa)) hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach lo) OR (sach hoi)) nang xa hoi. hieu va cham ((luc va) or (tuc xa)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: vu ((sach lo) OR (sach hoi)) nang xa hoi. hieu va cham ((luc va) or (tuc xa)) hanh vi cua tre*.