Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
chat hoc » chat hoa, chat thom, cho hoc
van anh » van thanh, tuan anh, van minh
nam duc » nam duoc, nam thuc, nam buoc
sach ly » sach y, sach lo, sach ty
te sach » toc sach
cao hoi » cau hoi, co hoi, cao hoc
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, cua triet
anh vi » hanh vi, anh va, anh ve
vi cua » vai cua, di cua

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 ly nang ((cao hoi) or (chat hoc)). hieu van ((nam duc) OR (pham duc)) van anh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly nang ((cao hoi) OR (chat hoc)). hieu van ((nam duc) OR (pham duc)) van anh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ly nang ((cao hoi) or (chat hoc)). hieu van ((nam duc) OR (pham duc)) van anh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ly nang ((cao hoi) or (chat hoc)). hieu van ((nam duc) OR (pham duc)) van anh vi cua tre*.