Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
danh dau » lanh dao, hang dau, danh tu
phan duc » pham duc, phan tu, phan dau
te sach » toc sach
dau cua » dai cua, day cua, cau cua
va danh » va dinh, va dan, va hanh
ve phan » va phan, ke phan, ve phat
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ky sang » ky nang, ky dang, ky tang
ma hoi » mai hoi, xa hoi, me hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (hoc sach)) ky sang ((ma hoi) or (ma hoa)). hieu ve phan duc va danh dau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (hoc sach)) ky sang ((ma hoi) OR (ma hoa)). hieu ve phan duc va danh dau cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (hoc sach)) ky sang ((ma hoi) or (ma hoa)). hieu ve phan duc va danh dau cua tre*.