Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
van nang » van quang, van ban, van dong
dinh cuu » dinh chi
dan dinh » dang dinh, doan dinh, van dinh
doc sach » toc sach, nuoc sach, dac sac
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
cuu tre » cua tre, cau tren, cau treo
nang o » nang co, nang ho, nang ro
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc va
va dan » ca dan, va dao, va dau
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)) van nang o hoc. hieu va cam luc va dan dinh cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (doc sach)) van nang o hoc. hieu va cam luc va dan dinh cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (doc sach)) van nang o hoc. hieu va cam luc va dan dinh cuu tre*.