Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
tang van » dang van, hoang van, trong van
hanh vai » hanh vi, hanh va, hanh tai
hau thuc » huu thuc, ha thuc, mau thuc
hieu van » hieu va, thien van, lieu va
cau tren » cu tren, dau tren, ca tren
ky tang » ky nang, ky dang, kho tang
van hoi » van hoa, van hoc, van hoe
van hau » van ha, van hai, van dau
so sach » so sanh, bo sach, co sach
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
vai cau » va cau, van cau, vai cac

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 (so sach)) ky tang van hoi. hieu van hau thuc va hanh vai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (so sach)) ky tang van hoi. hieu van hau thuc va hanh vai cau tren.
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (so sach)) ky tang van hoi. hieu van hau thuc va hanh vai cau tren*.