Perhaps you should try some spelling variations:
chat hoc » chat hoa, chat thom, cho hoc
hieu van » hieu va, thien van, lieu va
te sach » toc sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
cao hoc » co hoc, cho hoc
nam luc » nhan luc, nam thuc, nam duoc
cua tre » cua te, cuu tre, cua triet
anh va » hanh va
va cua » va chua, via cua, ca 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 hoc) or (chat hoc)). hieu van ((nam luc) or (nang luc)) tuan anh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly nang ((cao hoc) OR (chat hoc)). hieu van ((nam luc) OR (nang luc)) tuan anh va cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ly nang ((cao hoc) or (chat hoc)). hieu van ((nam luc) or (nang luc)) tuan anh va cua tre*.