Perhaps you should try some spelling variations:
dinh dien » tinh dien, kinh dien, dich dien
nuoc sach » nguoi sach, cuoc cach, cuon sach
hoc sach » hoc sinh, hoc cac, hoc anh
dien cua » dieu cua, dien cuc, dien cu
doc sach » toc sach, dac sac, bo sach
va dinh » van dinh, va kinh, va tinh
cam duc » cam xuc, cao duc, pham duc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
va cam » va cham, va cac, va cao
v nang » va nang, vu nang, van nang
o hoc » co hoc, mo hoc, so hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc sach) or (((doc sach) OR (nuoc sach)))) v nang o hoc. hieu va cam duc va dinh dien cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (((doc sach) OR (nuoc sach)))) v nang o hoc. hieu va cam duc va dinh dien cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) or (((doc sach) OR (nuoc sach)))) v nang o hoc. hieu va cam duc va dinh dien cua tre*".