Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
gia anh » gia thanh, gia dinh, gia linh
tuc gia » tac gia, duc gia, toc gia
cam tuc » cam xuc, cam tu, nam thuc
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
ly hang » ly quang
ve cam » ve cham, ve cac, va cam
anh vi » hanh vi, anh va, anh ve
vi cuu » vi luu, vinh cuu
o hai » co hai, so hai, o lai
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 ((ky nang) or (ly hang)) ((o hai) or (o hoc)). hieu ve cam tuc gia anh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((ky nang) OR (ly hang)) ((o hai) OR (o hoc)). hieu ve cam tuc gia anh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach ((ky nang) or (ly hang)) ((o hai) or (o hoc)). hieu ve cam tuc gia anh vi cuu tre*.