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

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