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