Perhaps you should try some spelling variations:
sach van » sach han, sach va, bach van
van nang » van quang, van ban, van dong
hanh lam » thanh lap, hanh kem, hanh va
lam cua » nam cua, lam chat
tu sach » thu sach, su sach, te sach
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
nang co » nang cao, nang doc, nang noi
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
co hoi » co hoc, co loi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach van nang co hoi. hieu ve cham ((xuc va) OR (luc va)) hanh lam cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach van nang co hoi. hieu ve cham ((xuc va) OR (luc va)) hanh lam cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach van nang co hoi. hieu ve cham ((xuc va) OR (luc va)) hanh lam cua tre*.