Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hanh hai » thanh hai, nhanh hai, hang hai
cau phuc » cau truc, chau phu, huu phuc
hai cua » thai cua, dai cua, hoi cua
vu hanh » vu khanh, vu thanh, du hanh
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
sach v » sach va, sach y, sach 2
me hoi » le hoi
v nang » va nang, vu nang, van nang

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 v nang ((me hoi) or (ma hoa)). ((hieu ve) or (hieu va)) cau phuc vu hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach v nang ((me hoi) OR (ma hoa)). ((hieu ve) OR (hieu va)) cau phuc vu hanh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach v nang ((me hoi) or (ma hoa)). ((hieu ve) or (hieu va)) cau phuc vu hanh hai cua tre*.