Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
toc sach » hoc sach, thuoc sach, toc san
cham luc » cham soc, nhan luc, cham cuu
van nang » van quang, van ban, van dong
doc sach » hoc sach, dac sac, bo sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va
di cua » dai cua, doi cua, de cua

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) or (((doc sach) OR (nuoc sach)))) van nang xa hoi. hieu va cham luc va hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (((doc sach) OR (nuoc sach)))) van nang xa hoi. hieu va cham luc va hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (((doc sach) OR (nuoc sach)))) van nang xa hoi. hieu va cham luc va hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (((doc sach) OR (nuoc sach)))) van nang xa hoi. hieu va cham luc va hanh di cua tre*.