Perhaps you should try some spelling variations:
doan dinh » doan hinh, doan tinh, doan minh
hoc sach » hoc sinh, hoc anh
dinh cuu » dinh chi
doc sach » toc sach, nuoc sach, dac sac
va doan » va doanh, van doan, va dan
cam luc » cam xuc, cau luc
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
hoc cac » hoc cao
nang o » nang co, nang ho, nang ro
v nang » va nang, vu nang, van nang
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc va
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 (hoc cac))) or (doc sach)) v nang o hoc. hieu va cam luc va doan dinh cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((hoc sach) OR (hoc cac))) OR (doc sach)) v nang o hoc. hieu va cam luc va doan dinh cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((hoc sach) OR (hoc cac))) or (doc sach)) v nang o hoc. hieu va cam luc va doan dinh cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((((hoc sach) OR (hoc cac))) or (doc sach)) v nang o hoc. hieu va cam luc va doan dinh cuu tre*.